__register_binfmt() made void

Just don't pass NULL to it - nobody does, anyway.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/arch/x86/ia32/ia32_aout.c b/arch/x86/ia32/ia32_aout.c
index 39e4909..cdfc8dc 100644
--- a/arch/x86/ia32/ia32_aout.c
+++ b/arch/x86/ia32/ia32_aout.c
@@ -519,7 +519,8 @@
 
 static int __init init_aout_binfmt(void)
 {
-	return register_binfmt(&aout_format);
+	register_binfmt(&aout_format);
+	return 0;
 }
 
 static void __exit exit_aout_binfmt(void)