[media] Fix sysfs rc protocol lookup for rc-5-sz

With the current matching rules the lookup for rc protocol named rc-5-sz matches with "rc-5" before finding "rc-5-sz". Thus one is able to never enable/disable the rc-5-sz protocol via sysfs.

Fix the lookup to require an exact match which allows the manipulation of sz protocol.
Signed-off-by: Antti Seppälä <a.seppala@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/rc/rc-main.c

@@ -844,7 +844,7 @@ static ssize_t store_protocols(struct device *device,
 			count++;
 		} else {
 			for (i = 0; i < ARRAY_SIZE(proto_names); i++) {
-				if (!strncasecmp(tmp, proto_names[i].name, strlen(proto_names[i].name))) {
+				if (!strcasecmp(tmp, proto_names[i].name)) {
 					tmp += strlen(proto_names[i].name);
 					mask = proto_names[i].type;
 					break;