remove temp files even from recursive call through diffdir (see the not much sense diff /boot /boot)

Reference: /n/sources/patch/applied/diff-rec
Date: Sat Nov  6 16:39:09 CET 2004

--- /sys/src/cmd/diff/main.c	Sat Nov  6 16:39:09 2004
+++ /sys/src/cmd/diff/main.c	Sat Nov  6 16:39:09 2004
@@ -136,10 +136,10 @@
 	Dir *fsb, *tsb;
 
 	if ((fp = statfile(f, &fsb)) == 0)
-		return;
+		goto Return;
 	if ((tp = statfile(t, &tsb)) == 0){
 		free(fsb);
-		return;
+		goto Return;
 	}
 	if (DIRECTORY(fsb) && DIRECTORY(tsb)) {
 		if (rflag || level == 0)
@@ -170,6 +170,8 @@
 	}
 	free(fsb);
 	free(tsb);
+Return:
+	rmtmpfiles();
 }
 
 void
@@ -231,10 +233,8 @@
 		free(fsb);
 	}
 	free(tsb);
-	for (i = 0; i < argc-1; i++) {
+	for (i = 0; i < argc-1; i++)
 		diff(argv[i], argv[argc-1], 0);
-		rmtmpfiles();
-	}
 	done(anychange);
 	/*NOTREACHED*/
 }