better verbose messages

tools/fimg2png.c

@@ -28,7 +28,8 @@ if (foo) {
 	}
 
 if (verbosity) {
-	fprintf(stderr, "image '%s' is %d x %d  %s\n",
+	fprintf(stderr, "%s: image '%s' is %d x %d  %s\n", 
+				__func__,
 				srcname, infos[0], infos[1],
 				fimg_str_type(infos[2]));
 	}
@@ -45,7 +46,8 @@ if (grisaille) {
 
 foo = fimg_save_as_png(&fimg, dstname, 0);
 if (foo) {
-	fprintf(stderr, "saving as png '%s' -> %d\n", dstname, foo);
+	fprintf(stderr, "%s: saving as png '%s' -> %d\n", __func__,
+					dstname, foo);
 	return -1;
 	}