ray_cs: Fix copy_from_user handling

I've not touched the other stuff here but the word "locking" comes to mind.
Signed-off-by: NAlan Cox <alan@linux.intel.com>
Cc: stable@kernel.org
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/net/wireless/ray_cs.c

@@ -2879,7 +2879,7 @@ static int write_essid(struct file *file, const char __user *buffer,
 		       unsigned long count, void *data)
 {
 	static char proc_essid[33];
-	int len = count;
+	unsigned int len = count;
 
 	if (len > 32)
 		len = 32;