kbuild: add missing return statement in modpost.c:secref_whitelist()

Noticed by: Magnus Damm <magnus@valinux.co.jp>

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 5028d46..16a19353 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -627,6 +627,7 @@
 		    (strcmp(tosec, ".init.text") == 0))
 		return 1;
 	}
+	return 0;
 }
 
 /**