[c] Fixed strcmp bug in SkeletonJson.c. Closes #870.

spine-c/spine-c/src/spine/SkeletonJson.c

@@ -361,7 +361,7 @@ static spAnimation* _spSkeletonJson_readAnimation (spSkeletonJson* self, Json* r
 				}
 				animation->timelines[animation->timelinesCount++] = SUPER_CAST(spTimeline, timeline);
 				animation->duration = MAX(animation->duration, timeline->frames[(timelineMap->size - 1) * PATHCONSTRAINTPOSITION_ENTRIES]);
-			} else if (strcmp(timelineName, "mix")) {
+			} else if (strcmp(timelineName, "mix") == 0) {
 				spPathConstraintMixTimeline* timeline = spPathConstraintMixTimeline_create(timelineMap->size);
 				timeline->pathConstraintIndex = constraintIndex;
 				for (valueMap = timelineMap->child, frameIndex = 0; valueMap; valueMap = valueMap->next, ++frameIndex) {