vcap,vdisp/aggregate: fix a leak

subissue of CID 472157, 472127

Author: MartinPulec

src/video_capture/aggregate.c

@@ -163,6 +163,7 @@ vidcap_aggregate_done(void *state)
                         vidcap_done(s->devices[i]);
                 }
         }
+        free((void *) s->devices);
 
         vf_free(s->frame);
         free(s);

src/video_display/aggregate.c

@@ -186,6 +186,7 @@ static void display_aggregate_done(void *state)
         for (unsigned int i = 0; i < s->devices_cnt; ++i) {
                 display_done(s->devices[i]);
         }
+        free((void *) s->devices);
 
         vf_free(s->frame);
         free(s->dev_frames);