mesa: Increment the list pointer while freeing instruction data

mesa: Increment the list pointer while freeing instruction data

Since the list pointer was never incremented when a OPCODE_PIXEL_MAP
opcode was encountered, the data for the instruction would get freed
over and over and over... resulting in a crash.

Fixes gl-1.0-beginend-coverage.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=72214
Reviewed-by: Brian Paul <brianp@vmware.com>
Cc: Lu Ha <huax.lu@intel.com>