videostab/filter_videostab2.c: check for null
videostab/filter_videostab2.c: check for null

Fixes Coverity CID 709405: Dereference before null check (REVERSE_INULL)
Directly dereferencing pointer "data".
244        data->stab = calloc( 1, sizeof(StabData) );
245        data->trans = calloc( 1, sizeof (TransformData) ) ;
Dereferencing "data" before a null check.
246        if ( data )

gmarco/mlt-orig,siddharudh/mlt,siddharudh/mlt,wideioltd/mlt,xzhavilla/mlt,zzhhui/mlt,mltframework/mlt,j-b-m/mlt,anba8005/mlt,j-b-m/mlt,siddharudh/mlt,wideioltd/mlt,wideioltd/mlt,siddharudh/mlt,xzhavilla/mlt,wideioltd/mlt,j-b-m/mlt,mltframework/mlt,j-b-m/mlt,j-b-m/mlt,zzhhui/mlt,j-b-m/mlt,zzhhui/mlt,mltframework/mlt,gmarco/mlt-orig,zzhhui/mlt,anba8005/mlt,zzhhui/mlt,gmarco/mlt-orig,xzhavilla/mlt,wideioltd/mlt,anba8005/mlt,gmarco/mlt-orig,anba8005/mlt,zzhhui/mlt,j-b-m/mlt,gmarco/mlt-orig,gmarco/mlt-orig,mltframework/mlt,mltframework/mlt,anba8005/mlt,siddharudh/mlt,xzhavilla/mlt,wideioltd/mlt,zzhhui/mlt,xzhavilla/mlt,zzhhui/mlt,anba8005/mlt,j-b-m/mlt,wideioltd/mlt,mltframework/mlt,anba8005/mlt,siddharudh/mlt,j-b-m/mlt,j-b-m/mlt,xzhavilla/mlt,mltframework/mlt,siddharudh/mlt,xzhavilla/mlt,gmarco/mlt-orig,anba8005/mlt,mltframework/mlt,mltframework/mlt,wideioltd/mlt,xzhavilla/mlt,siddharudh/mlt,anba8005/mlt,mltframework/mlt,gmarco/mlt-orig,xzhavilla/mlt,zzhhui/mlt,siddharudh/mlt,gmarco/mlt-orig,wideioltd/mlt