mtd: slram: insert break after errors in parsing the map

GCC 12.3.0 compiler on linux-next next-20240709 tree found the execution
path in which, due to lazy evaluation, devlength isn't initialised with the
parsed string:

289 while (map) {
290 devname = devstart = devlength = NULL;
291
292 if (!(devname = strsep(&map, ","))) {
293 E("slram: No devicename specified.\n");
294 break;
295 }
296 T("slram: devname = %s\n", devname);
297 if ((!map) || (!(devstart = strsep(&map, ",")))) {
298 E("slram: No devicestart specified.\n");
299 }
300 T("slram: devstart = %s\n", devstart);
→ 301 if ((!map) || (!(devlength = strsep(&map, ",")))) {
302 E("slram: No devicelength / -end specified.\n");
303 }
→ 304 T("slram: devlength = %s\n", devlength);
305 if (parse_cmdline(devname, devstart, devlength) != 0) {
306 return(-EINVAL);
307 }

Parsing should be finished after map == NULL, so a break is best inserted after
each E("slram: ... \n") error message.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: Miquel Raynal <[e-mail]>
Cc: Richard Weinberger <[e-mail]>
Cc: Vignesh Raghavendra <[e-mail]>
Cc: [e-mail]
Signed-off-by: Mirsad Todorovac <[e-mail]>
Signed-off-by: Miquel Raynal <[e-mail]>
Link: https://lore.kernel.org/linux-mtd/[e-mail]

drivers/mtd/devices/slram.c

···
 		T("slram: devname = %s\n", devname);
 		if ((!map) || (!(devstart = strsep(&map, ",")))) {
 			E("slram: No devicestart specified.\n");
+			break;
 		}
 		T("slram: devstart = %s\n", devstart);
 		if ((!map) || (!(devlength = strsep(&map, ",")))) {
 			E("slram: No devicelength / -end specified.\n");
+			break;
 		}
 		T("slram: devlength = %s\n", devlength);
 		if (parse_cmdline(devname, devstart, devlength) != 0) {