Check for request errors before checking if the request was aborted

Make sure the request did not receive an error status code (and hence the response is unavailable) before assuming it was aborted.

@@ -378,22 +378,22 @@ var
         // the segment request is no longer outstanding
         segmentXhr = null;
 
-        // stop processing if the request was aborted
-        if (!this.response) {
-          return;
-        }
-
         // trigger an error if the request was not successful
         if (this.status >= 400) {
           player.hls.error = {
-            status: segmentXhr.status,
+            status: this.status,
             message: 'HLS segment request error at URL: ' + segmentUri,
-            code: (segmentXhr.status >= 500) ? 4 : 2
+            code: (this.status >= 500) ? 4 : 2
           };
           player.trigger('error');
           return;
         }
 
+        // stop processing if the request was aborted
+        if (!this.response) {
+          return;
+        }
+
         // calculate the download bandwidth
         player.hls.segmentXhrTime = (+new Date()) - startTime;
         player.hls.bandwidth = (this.response.byteLength / player.hls.segmentXhrTime) * 8 * 1000;