Use warning function instead of fprintf(stderr, "Warning: ...").

Signed-off-by: NThiago Farina <tfransosi@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

bisect.c

@@ -813,11 +813,11 @@ static void handle_skipped_merge_base(const unsigned char *mb)
 	char *bad_hex = sha1_to_hex(current_bad_sha1);
 	char *good_hex = join_sha1_array_hex(&good_revs, ' ');
 
-	fprintf(stderr, "Warning: the merge base between %s and [%s] "
+	warning("the merge base between %s and [%s] "
 		"must be skipped.\n"
 		"So we cannot be sure the first bad commit is "
 		"between %s and %s.\n"
-		"We continue anyway.\n",
+		"We continue anyway.",
 		bad_hex, good_hex, mb_hex, bad_hex);
 	free(good_hex);
 }

builtin-mv.c

@@ -169,9 +169,7 @@ int cmd_mv(int argc, const char **argv, const char *prefix)
 				 * check both source and destination
 				 */
 				if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
-					fprintf(stderr, "Warning: %s;"
-							" will overwrite!\n",
-							bad);
+					warning("%s; will overwrite!", bad);
 					bad = NULL;
 				} else
 					bad = "Cannot overwrite";

http.c

@@ -1244,7 +1244,7 @@ int finish_http_object_request(struct http_object_request *freq)
 	process_http_object_request(freq);
 
 	if (freq->http_code == 416) {
-		fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
+		warning("requested range invalid; we may already have all the data.");
 	} else if (freq->curl_result != CURLE_OK) {
 		if (stat(freq->tmpfile, &st) == 0)
 			if (st.st_size == 0)

t/t6030-bisect-porcelain.sh

@@ -423,7 +423,7 @@ test_expect_success 'skipped merge base when good and bad are siblings' '
 	grep "merge base must be tested" my_bisect_log.txt &&
 	grep $HASH4 my_bisect_log.txt &&
 	git bisect skip > my_bisect_log.txt 2>&1 &&
-	grep "Warning" my_bisect_log.txt &&
+	grep "warning" my_bisect_log.txt &&
 	grep $SIDE_HASH6 my_bisect_log.txt &&
 	git bisect reset
 '