Fix GCC7 warnings about string truncation

GCC7 with -Wall warns about possible string truncation with
snprint()-type functions with "directive output may be truncated writing
1 byte into a region of size between 0 and 9
[-Werror=format-truncation=]" + "note: ‘snprintf’ output between 5 and
14 bytes into a destination of size 12" (or similar). Fix this by
increasing sizes of buffers.

See https://gcc.gnu.org/gcc-7/changes.html

Change-Id: Ib848f2a56dd658783534158947ae1be7c0e99d45
Signed-off-by: Freddie Chopin <freddie.chopin@gmail.com>
Reviewed-on: http://openocd.zylin.com/4175
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Tested-by: jenkins
Reviewed-by: Andreas Bolsch <hyphen0break@gmail.com>

src/target/nds32_cmd.c

@@ -816,7 +816,7 @@ static int jim_nds32_bulk_read(Jim_Interp *interp, int argc, Jim_Obj * const *ar
 	uint32_t *data = malloc(count * sizeof(uint32_t));
 	int result;
 	result = target_read_buffer(target, address, count * 4, (uint8_t *)data);
-	char data_str[11];
+	char data_str[12];
 
 	jim_wide i;
 	Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));