AFS: Fix possible null pointer dereference in afs_alloc_server()

Fix a possible null pointer dereference in afs_alloc_server(): the server
pointer is NULL if there was an allocation failure, and under such a
condition, we can't dereference it in the _leave() statement.

Signed-off-by: Denis Kirjanov <[e-mail]>
Signed-off-by: David Howells <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

fs/afs/server.c

···
 
 		memcpy(&server->addr, addr, sizeof(struct in_addr));
 		server->addr.s_addr = addr->s_addr;
+		_leave(" = %p{%d}", server, atomic_read(&server->usage));
+	} else {
+		_leave(" = NULL [nomem]");
 	}
-
-	_leave(" = %p{%d}", server, atomic_read(&server->usage));
 	return server;
 }