video/readers/jpeg: Don't decode data before start of stream

video/readers/jpeg: Don't decode data before start of stream

When a start of stream marker is encountered, we call grub_jpeg_decode_sos()
which allocates space for a bitmap.

When a restart marker is encountered, we call grub_jpeg_decode_data() which
then fills in that bitmap.

If we get a restart marker before the start of stream marker, we will
attempt to write to a bitmap_ptr that hasn't been allocated. Catch this
and bail out. This fixes an attempt to write to NULL.

Signed-off-by: Daniel Axtens <dja@axtens.net>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>