Factor out code to convert local "url" into a path.

Previously this code was shared between `local_push` and `local_connect`.

src/transports/local.c

@@ -156,6 +156,24 @@ on_error:
 	return -1;
 }
 
+static int path_from_url_or_path(git_buf *local_path_out, const char *url_or_path)
+{
+	int error;
+
+	/* If url_or_path begins with file:// treat it as a URL */
+	if (!git__prefixcmp(url_or_path, "file://")) {
+		if ((error = git_path_fromurl(local_path_out, url_or_path)) < 0) {
+			return error;
+		}
+	} else { /* We assume url_or_path is already a path */
+		if ((error = git_buf_sets(local_path_out, url_or_path)) < 0) {
+			return error;
+		}
+	}
+
+	return 0;
+}
+
 /*
  * Try to open the url as a git directory. The direction doesn't
  * matter in this case because we're calulating the heads ourselves.
@@ -181,17 +199,12 @@ static int local_connect(
 	t->direction = direction;
 	t->flags = flags;
 
-	/* The repo layer doesn't want the prefix */
-	if (!git__prefixcmp(t->url, "file://")) {
-		if (git_path_fromurl(&buf, t->url) < 0) {
-			git_buf_free(&buf);
-			return -1;
-		}
-		path = git_buf_cstr(&buf);
-
-	} else { /* We assume transport->url is already a path */
-		path = t->url;
+	/* 'url' may be a url or path; convert to a path */
+	if ((error = path_from_url_or_path(&buf, url)) < 0) {
+		git_buf_free(&buf);
+		return error;
 	}
+	path = git_buf_cstr(&buf);
 
 	error = git_repository_open(&repo, path);
 
@@ -350,17 +363,12 @@ static int local_push(
 	unsigned int i;
 	size_t j;
 
-	/* The repo layer doesn't want the prefix */
-	if (!git__prefixcmp(push->remote->url, "file://")) {
-		if (git_path_fromurl(&buf, push->remote->url) < 0) {
-			git_buf_free(&buf);
-			return -1;
-		}
-		path = git_buf_cstr(&buf);
-
-	} else { /* We assume push->remote->url is already a path */
-		path = push->remote->url;
+	/* 'push->remote->url' may be a url or path; convert to a path */
+	if ((error = path_from_url_or_path(&buf, push->remote->url)) < 0) {
+		git_buf_free(&buf);
+		return error;
 	}
+	path = git_buf_cstr(&buf);
 
 	error = git_repository_open(&remote_repo, path);