http: simplify http_error helper function

This helper function should really be a one-liner that
prints an error message, but it has ended up unnecessarily
complicated:

  1. We call error() directly when we fail to start the curl
     request, so we must later avoid printing a duplicate
     error in http_error().

     It would be much simpler in this case to just stuff the
     error message into our usual curl_errorstr buffer
     rather than printing it ourselves. This means that
     http_error does not even have to care about curl's exit
     value (the interesting part is in the errorstr buffer
     already).

  2. We return the "ret" value passed in to us, but none of
     the callers actually cares about our return value. We
     can just drop this entirely.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

http-push.c

@@ -1551,7 +1551,7 @@ static int remote_exists(const char *path)
 		ret = 0;
 		break;
 	case HTTP_ERROR:
-		http_error(url, HTTP_ERROR);
+		http_error(url);
 	default:
 		ret = -1;
 	}

http.c

@@ -857,7 +857,8 @@ static int http_request(const char *url, struct strbuf *type,
 		run_active_slot(slot);
 		ret = handle_curl_result(&results);
 	} else {
-		error("Unable to start HTTP request for %s", url);
+		snprintf(curl_errorstr, sizeof(curl_errorstr),
+			 "failed to start HTTP request");
 		ret = HTTP_START_FAILED;
 	}
 
@@ -940,13 +941,9 @@ static int http_get_file(const char *url, const char *filename, int options)
 	return ret;
 }
 
-int http_error(const char *url, int ret)
+void http_error(const char *url)
 {
-	/* http_request has already handled HTTP_START_FAILED. */
-	if (ret != HTTP_START_FAILED)
-		error("%s while accessing %s", curl_errorstr, url);
-
-	return ret;
+	error("%s while accessing %s", curl_errorstr, url);
 }
 
 int http_fetch_ref(const char *base, struct ref *ref)

http.h

@@ -136,10 +136,9 @@ extern char *get_remote_object_url(const char *url, const char *hex,
 int http_get_strbuf(const char *url, struct strbuf *content_type, struct strbuf *result, int options);
 
 /*
- * Prints an error message using error() containing url and curl_errorstr,
- * and returns ret.
+ * Prints an error message using error() containing url and curl_errorstr.
  */
-int http_error(const char *url, int ret);
+void http_error(const char *url);
 
 extern int http_fetch_ref(const char *base, struct ref *ref);
 

remote-curl.c

@@ -216,7 +216,7 @@ static struct discovery* discover_refs(const char *service, int for_push)
 		die("Authentication failed for '%s'", url);
 	default:
 		show_http_message(&type, &buffer);
-		http_error(url, http_ret);
+		http_error(url);
 		die("HTTP request failed");
 	}