[PATCH] Fix 'unsigned' < 0 checks

Using "-W" found a few places that should probably use signed
variables since they can contain (and check for) negative error
values.

net/core/sock.c

@@ -443,7 +443,8 @@ int sock_getsockopt(struct socket *sock, int level, int optname,
 		struct timeval tm;
 	} v;
 	
-	unsigned int lv=sizeof(int),len;
+	unsigned int lv = sizeof(int);
+	int len;
   	
   	if(get_user(len,optlen))
   		return -EFAULT;

security/selinux/hooks.c

@@ -1792,7 +1792,8 @@ static inline void flush_unauthorized_files(struct files_struct * files)
 
 	spin_lock(&files->file_lock);
 	for (;;) {
-		unsigned long set, i, fd;
+		unsigned long set, i;
+		int fd;
 
 		j++;
 		i = j * __NFDBITS;