cris/kgdb: Fix buffer overflow in getpacket()

arch/cris/arch-v10/kernel/kgdb.c: In function 'handle_exception':
arch/cris/arch-v10/kernel/kgdb.c:534:17: warning: array subscript is above array bounds [-Warray-bounds]
Signed-off-by: NGeert Uytterhoeven <geert@linux-m68k.org>

arch/cris/arch-v10/kernel/kgdb.c

@@ -523,7 +523,7 @@ getpacket (char *buffer)
 		xmitcsum = -1;
 		count = 0;
 		/* Read until a # or the end of the buffer is reached */
-		while (count < BUFMAX) {
+		while (count < BUFMAX - 1) {
 			ch = getDebugChar ();
 			if (ch == '#')
 				break;