checkpatch: debugfs_remove() can take NULL

index f18750e..c041e97 100755
@@ -3213,21 +3213,30 @@ sub process {
 				$herecurr);
 		}
 
+# check for needless "if (<foo>) fn(<foo>)" uses
+		if ($prevline =~ /\bif\s*\(\s*($Lval)\s*\)/) {
+			my $expr = '\s*\(\s*' . quotemeta($1) . '\s*\)\s*;';
+
 # check for needless kfree() checks
-		if ($prevline =~ /\bif\s*\(([^\)]*)\)/) {
-			my $expr = $1;
-			if ($line =~ /\bkfree\(\Q$expr\E\);/) {
+			if ($line =~ /\bkfree$expr/) {
 				WARN("NEEDLESS_KFREE",
 				     "kfree(NULL) is safe this check is probably not required\n" . $hereprev);
 			}
-		}
 # check for needless usb_free_urb() checks
-		if ($prevline =~ /\bif\s*\(([^\)]*)\)/) {
-			my $expr = $1;
-			if ($line =~ /\busb_free_urb\(\Q$expr\E\);/) {
+			if ($line =~ /\busb_free_urb$expr/) {
 				WARN("NEEDLESS_USB_FREE_URB",
 				     "usb_free_urb(NULL) is safe this check is probably not required\n" . $hereprev);
 			}
+# check for needless debugfs_remove() and debugfs_remove_recursive*() checks
+			if ($line =~ /\b(debugfs_remove(?:_recursive)?)$expr/) {
+				WARN("NEEDLESS_DEBUGFS_REMOVE",
+				     "$1(NULL) is safe this check is probably not required\n" . $hereprev);
+			}
+# check for needless debugfs_remove_recursive() and debugfs_remove_recursive*() checks
+			if ($line =~ /\b(debugfs_remove_recursive(?:_recursive)?)$expr/) {
+				WARN("NEEDLESS_DEBUGFS_REMOVE_RECURSIVE",
+				     "$1(NULL) is safe this check is probably not required\n" . $hereprev);
+			}
 		}
 
 # prefer usleep_range over udelay