If the input media resource is invalid, MediaPlayer create calling may
fail and returns null, so trigger one NullPointerException.
Add the null pointer judegement when calling seekto and so on.
Test: manual
Fixes: 130032215
Change-Id: I38cb08584aa4e4c2ce4dc58a5a095960c7bd1948
Signed-off-by: Hoff Cheng <hoffc@qti.qualcomm.com>