[NET]: Undo marking sock_alloc() as static, still exported to modules.

net/socket.c

@@ -457,7 +457,7 @@ struct socket *sockfd_lookup(int fd, int *err)
  *	NULL is returned.
  */
 
-static struct socket *sock_alloc(void)
+struct socket *sock_alloc(void)
 {
 	struct inode * inode;
 	struct socket * sock;