st/va: delay calling begin_frame until we have all parameters

If begin_frame is called before setting intra_matrix and
non_intra_matrix it leads to segmentation faults when
vl_mpeg12_decoder.c is used.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=92634
Signed-off-by: Nayan Deshmukh <nayan26deshmukh@gmail.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
1 file changed