Fix a memory corruption to prevent segfault in VP8

Fixed a memory corruption in psb-video. Check the value
of numAdapt before modifying the info[] in GetPortId.
Without this check it will cause a memory corruption
leading to intermittent segfaults in Chrome browser.

Change-Id: I1bae44886e9cb0deab8aa5abe5ceafa6e778350d
Signed-off-by: Sameer Kibey <sameer.kibey@intel.com>