Fix bug in JetPlayer::loadFromFile

A long pathname would corrupt the heap due to incorrect use of strncpy.

Also was using hard-coded constant 256 instead of PATH_MAX.

Change-Id: Iba382bbb38624fbc41fec91449f9814f77d4ac0d
diff --git a/include/media/JetPlayer.h b/include/media/JetPlayer.h
index 6d53989..491a950 100644
--- a/include/media/JetPlayer.h
+++ b/include/media/JetPlayer.h
@@ -94,7 +94,7 @@
     S_JET_STATUS        mJetStatus;
     S_JET_STATUS        mPreviousJetStatus;
 
-    char                mJetFilePath[256];
+    char                mJetFilePath[PATH_MAX];
 
     class JetPlayerThread : public Thread {
     public: