mpeg2parser: deinit bit reader before return
mpeg2parser: deinit bit reader before return

else it will expose function local variable to other function

Change-Id: I0892d004633805e92581f5e6e25b0b9263f1a33b
Signed-off-by: Xu Guangxin <0f669b203965911dd47bd63faa23578e608c888e@intel.com>

uartie/libyami,dspmeng/libyami,clearlylin/libyami,dspmeng/libyami,YuJiankang/libyami,01org/libyami,stripes416/libyami,lizhong1008/libyami,zhaobob/libyami,yizhouwei/libyami,chivakker/libyami,stripes416/libyami,01org/libyami,YuJiankang/libyami,seanvk/libyami,zhaobob/libyami,seanvk/libyami,lizhong1008/libyami,chivakker/libyami,clearlylin/libyami,yizhouwei/libyami,zhaobob/libyami,YuJiankang/libyami,lizhong1008/libyami,seanvk/libyami,uartie/libyami,stripes416/libyami,yizhouwei/libyami,chivakker/libyami,uartie/libyami,clearlylin/libyami,dspmeng/libyami,01org/libyami