WUtil: fix posible crash in 'wgethomedir' (Coverity #50070)

As pointed by Coverity, if the user does not a an entry in the password
file then the function would assume its home path to be "/" but still
continue and later try to check for user->pw_dir which would dereference
the NULL pointer.

Signed-off-by: Christophe CURIS <christophe.curis@free.fr>

WINGs/findfile.c

@@ -57,6 +57,7 @@ char *wgethomedir()
 	if (!user) {
 		werror(_("could not get password entry for UID %i"), getuid());
 		home = "/";
+		return home;
 	}
 
 	if (!user->pw_dir)