[PATCH] uml: non-void functions should return something

There are a few functions which are declared to return something, but don't.
These are actually infinite loops which are forced to be declared as non-void.
 This makes them all return 0.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/um/kernel/sigio_user.c

@@ -216,6 +216,8 @@ static int write_sigio_thread(void *unused)
 				       "err = %d\n", -n);
 		}
 	}
+
+	return 0;
 }
 
 static int need_poll(int n)