make get_file() return its argument

simplifies a bunch of callers...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/net/compat.c b/net/compat.c
index 74ed1d7..79ae884 100644
--- a/net/compat.c
+++ b/net/compat.c
@@ -301,8 +301,7 @@
 			break;
 		}
 		/* Bump the usage count and install the file. */
-		get_file(fp[i]);
-		fd_install(new_fd, fp[i]);
+		fd_install(new_fd, get_file(fp[i]));
 	}
 
 	if (i > 0) {