get_maintainer: fix perl 5.22/5.24 deprecated/incompatible "\C" use

from linux commit ce8155f7a3d5:

Perl 5.22 emits a deprecated message when "\C" is used in a regex. Perl 5.24 will disallow it altogether.

Fix it by using [A-Z] instead of \C.

From linux adapted to U-Boot by:

Signed-off-by Heiko Schocher <[email protected]>

---
running get_maintainer.pl drops warnings with PERL > 5.22 . In linux this is fixed though above commit.

With the original linux patch applied to u-boot, there is following warning:

^* matches null string many times in regex; marked by <-- HERE in m/^* <-- HERE /@./scripts/get_maintainer.pl line 739. ^* matches null string many times in regex; marked by <-- HERE in m/^* <-- HERE //@./scripts/get_maintainer.pl line 735.

The change in MAINTAINERS fixes this, but I get differences when running the python script:
import os
import subprocess

root_dir = '.'

for directory, subdirectories, files in os.walk(root_dir):
for file in files:
tmp=os.path.join(directory, file)
print(tmp)
ret = subprocess.call(["scripts/get_maintainer.pl", "-f", tmp])

and comparing the output from it, based on the original u-boot code and the code with this patch ...

I have no PERL experience, so made this patch as RFC, maybe someone with better PERL skills can fix it correct.

 MAINTAINERS               |  4 ++--
 scripts/get_maintainer.pl | 22 +++++++++++-----------
 2 files changed, 13 insertions(+), 13 deletions(-)

MAINTAINERS +2 -2

index 5b3c93a..a197cd0 100644
@@ -417,5 +417,5 @@ L:	u-boot at lists.denx.de
 Q:	http://patchwork.ozlabs.org/project/uboot/list/
 S:	Maintained
 T:	git git://git.denx.de/u-boot.git
-F:	*
-F:	*/
+F:	.*
+F:	.*/

scripts/get_maintainer.pl +0 -0

index 4707dfd..308d7f0 100755

scripts/get_maintainer.pl +10 -10

 	    my $type = $1;
 	    my $value = $2;
 

@@ -533,7 +533,7 @@ sub range_is_maintained {
 
     for (my $i = $start; $i < $end; $i++) {
 	my $line = $typevalue[$i];
-	if ($line =~ m/^(\C):\s*(.*)/) {
+	if ($line =~ m/^([A-Z]):\s*(.*)/) {
 	    my $type = $1;
 	    my $value = $2;
 	    if ($type eq 'S') {

@@ -551,7 +551,7 @@ sub range_has_maintainer {
 
     for (my $i = $start; $i < $end; $i++) {
 	my $line = $typevalue[$i];
-	if ($line =~ m/^(\C):\s*(.*)/) {
+	if ($line =~ m/^([A-Z]):\s*(.*)/) {
 	    my $type = $1;
 	    my $value = $2;
 	    if ($type eq 'M') {

@@ -600,7 +600,7 @@ sub get_maintainers {
 
 	    for ($i = $start; $i < $end; $i++) {
 		my $line = $typevalue[$i];
-		if ($line =~ m/^(\C):\s*(.*)/) {
+		if ($line =~ m/^([A-Z]):\s*(.*)/) {
 		    my $type = $1;
 		    my $value = $2;
 		    if ($type eq 'X') {

@@ -615,7 +615,7 @@ sub get_maintainers {
 	    if (!$exclude) {
 		for ($i = $start; $i < $end; $i++) {
 		    my $line = $typevalue[$i];
-		    if ($line =~ m/^(\C):\s*(.*)/) {
+		    if ($line =~ m/^([A-Z]):\s*(.*)/) {
 			my $type = $1;
 			my $value = $2;
 			if ($type eq 'F') {

@@ -917,7 +917,7 @@ sub find_first_section {
 
     while ($index < @typevalue) {
 	my $tv = $typevalue[$index];
-	if (($tv =~ m/^(\C):\s*(.*)/)) {
+	if (($tv =~ m/^([A-Z]):\s*(.*)/)) {
 	    last;
 	}
 	$index++;

@@ -931,7 +931,7 @@ sub find_starting_index {
 
     while ($index > 0) {
 	my $tv = $typevalue[$index];
-	if (!($tv =~ m/^(\C):\s*(.*)/)) {
+	if (!($tv =~ m/^([A-Z]):\s*(.*)/)) {
 	    last;
 	}
 	$index--;

@@ -945,7 +945,7 @@ sub find_ending_index {
 
     while ($index < @typevalue) {
 	my $tv = $typevalue[$index];
-	if (!($tv =~ m/^(\C):\s*(.*)/)) {
+	if (!($tv =~ m/^([A-Z]):\s*(.*)/)) {
 	    last;
 	}
 	$index++;

@@ -971,7 +971,7 @@ sub get_maintainer_role {
 
     for ($i = $start + 1; $i < $end; $i++) {
 	my $tv = $typevalue[$i];
-	if ($tv =~ m/^(\C):\s*(.*)/) {
+	if ($tv =~ m/^([A-Z]):\s*(.*)/) {
 	    my $ptype = $1;
 	    my $pvalue = $2;
 	    if ($ptype eq "S") {

@@ -1030,7 +1030,7 @@ sub add_categories {
 
     for ($i = $start + 1; $i < $end; $i++) {
 	my $tv = $typevalue[$i];
-	if ($tv =~ m/^(\C):\s*(.*)/) {
+	if ($tv =~ m/^([A-Z]):\s*(.*)/) {
 	    my $ptype = $1;
 	    my $pvalue = $2;
 	    if ($ptype eq "L") {

@@ -1072,7 +1072,7 @@ sub add_categories {
 		if ($name eq "") {
 		    if ($i > 0) {
 			my $tv = $typevalue[$i - 1];
-			if ($tv =~ m/^(\C):\s*(.*)/) {
+			if ($tv =~ m/^([A-Z]):\s*(.*)/) {
 			    if ($1 eq "P") {
 				$name = $2;
 				$pvalue = format_email($name, $address, $email_usename);