prevent the segment xhr error handler from being called during seek

When an XHR is aborted, the error handler is called. The error handler for the
segment loader increments the mediaIndex of the player. This is undesired
because setCurrentTime has already set the mediaIndex to the proper target
segment.

@@ -195,11 +195,7 @@ videojs.Hls.prototype.setCurrentTime = function(currentTime) {
   this.sourceBuffer.abort();
   this.sourceBuffer.abort();
 
 
   // cancel outstanding requests and buffer appends
   // cancel outstanding requests and buffer appends
-  if (this.segmentXhr_) {
-    this.segmentXhr_.onreadystatechange = null;
-    this.segmentXhr_.abort();
-    this.segmentXhr_ = null;
-  }
+  this.cancelSegmentXhr();
 
 
   // fetch new encryption keys, if necessary
   // fetch new encryption keys, if necessary
   if (keyXhr) {
   if (keyXhr) {
@@ -244,11 +240,8 @@ videojs.Hls.prototype.updateDuration = function(playlist) {
  * state suitable for switching to a different video.
  * state suitable for switching to a different video.
  */
  */
 videojs.Hls.prototype.resetSrc_ = function() {
 videojs.Hls.prototype.resetSrc_ = function() {
-  if (this.segmentXhr_) {
-    this.segmentXhr_.onreadystatechange = null;
-    this.segmentXhr_.abort();
-    this.segmentXhr_ = null;
-  }
+  this.cancelSegmentXhr();
+
   if (keyXhr) {
   if (keyXhr) {
     keyXhr.onreadystatechange = null;
     keyXhr.onreadystatechange = null;
     keyXhr.abort();
     keyXhr.abort();
@@ -259,6 +252,15 @@ videojs.Hls.prototype.resetSrc_ = function() {
   }
   }
 };
 };
 
 
+videojs.Hls.prototype.cancelSegmentXhr = function() {
+  if (this.segmentXhr_) {
+    // Prevent error handler from running.
+    this.segmentXhr_.onreadystatechange = null;
+    this.segmentXhr_.abort();
+    this.segmentXhr_ = null;
+  }
+};
+
 /**
 /**
  * Abort all outstanding work and cleanup.
  * Abort all outstanding work and cleanup.
  */
  */