rv10: Validate the dimensions set from the container

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>
(cherry picked from commit 5372cda67109848d22146289e401669266217e80)
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
(cherry picked from commit 0b0f1cd44ece180e12795cfc8d0a0ac5ea3ebe2c)
idroqdec: Make sure a video stream has been allocated before returning packets

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>
(cherry picked from commit bcbe4f3ceb6ee0210d3a401963518906c8b9b230)
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
(cherry picked from commit de75bc01cda53acfbd9f901639695ade8e650c43)