make get_file() return its argument

simplifies a bunch of callers...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 4dfbcea..651d845 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2135,8 +2135,7 @@
 	if (!IS_ERR(devnull)) {
 		/* replace all the matching ones with this */
 		do {
-			get_file(devnull);
-			replace_fd(n - 1, devnull, 0);
+			replace_fd(n - 1, get_file(devnull), 0);
 		} while ((n = iterate_fd(files, n, match_file, cred)) != 0);
 		fput(devnull);
 	} else {