check that p_pic->pf_release != NULL before calling it

modules/video_filter/adjust.c

@@ -426,6 +426,7 @@ static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
     p_outpic->b_progressive = p_pic->b_progressive;
     p_outpic->b_top_field_first = p_pic->b_top_field_first;
 
+    if( p_pic->pf_release )
         p_pic->pf_release( p_pic );
 
     return p_outpic;

modules/video_filter/gradient.c

@@ -240,6 +240,7 @@ static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
     p_outpic->b_progressive = p_pic->b_progressive;
     p_outpic->b_top_field_first = p_pic->b_top_field_first;
 
+    if( p_pic->pf_release )
         p_pic->pf_release( p_pic );
 
     return p_outpic;

modules/video_filter/invert.c

@@ -170,6 +170,7 @@ static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
     p_outpic->b_progressive = p_pic->b_progressive;
     p_outpic->b_top_field_first = p_pic->b_top_field_first;
 
+    if( p_pic->pf_release )
         p_pic->pf_release( p_pic );
 
     return p_outpic;

modules/video_filter/psychedelic.c

@@ -246,6 +246,7 @@ static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
     p_outpic->b_progressive = p_pic->b_progressive;
     p_outpic->b_top_field_first = p_pic->b_top_field_first;
 
+    if( p_pic->pf_release )
         p_pic->pf_release( p_pic );
 
     return p_outpic;

modules/video_filter/ripple.c

@@ -205,6 +205,7 @@ static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
     p_outpic->b_progressive = p_pic->b_progressive;
     p_outpic->b_top_field_first = p_pic->b_top_field_first;
 
+    if( p_pic->pf_release )
         p_pic->pf_release( p_pic );
 
     return p_outpic;

modules/video_filter/wave.c

@@ -192,6 +192,7 @@ static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
     p_outpic->b_progressive = p_pic->b_progressive;
     p_outpic->b_top_field_first = p_pic->b_top_field_first;
 
+    if( p_pic->pf_release )
         p_pic->pf_release( p_pic );
 
     return p_outpic;