input/joystick: magellan: Mark __nonstring look-up table

GCC 15's new -Wunterminated-string-initialization notices that the 16 character lookup table "nibbles" (which is not used as a C-String) needs to be marked as "nonstring":

drivers/input/joystick/magellan.c: In function 'magellan_crunch_nibbles':
drivers/input/joystick/magellan.c:51:44: warning: initializer-string for array of 'unsigned char' truncates NUL terminator but destination lacks 'nonstring' attribute (17 chars into 16 available) [-Wunterminated-string-initialization]

   51 |         static unsigned char nibbles[16] = "0AB3D56GH9:K<MN?";
      |                                            ^~~~~~~~~~~~~~~~~~

Add the annotation and While at it, mark the table as const too.

---
Cc: Dmitry Torokhov <[email protected]>
Cc: Erick Archer <[email protected]>
Cc: Christophe JAILLET <[email protected]>
Cc: [email protected]

---
 drivers/input/joystick/magellan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index 2eaa25c9c68c..7622638e5bb8 100644
@@ -48,7 +48,7 @@ struct magellan {
 
 static int magellan_crunch_nibbles(unsigned char *data, int count)
 {
-	static unsigned char nibbles[16] = "0AB3D56GH9:K<MN?";
+	static const unsigned char nibbles[16] __nonstring = "0AB3D56GH9:K<MN?";
 
 	do {
 		if (data[count] == nibbles[data[count] & 0xf])

2.34.1

Applied, thank you.

Dmitry