yadif: fix variable type

Signed-off-by: Thomas Guillem <thomas@gllm.fr>
(cherry picked from commit 77b86f4452)
Signed-off-by: Thomas Guillem <thomas@gllm.fr>

modules/video_filter/deinterlace/yadif.h

@@ -140,10 +140,10 @@ static void yadif_filter_line_c(uint8_t *dst, uint8_t *prev, uint8_t *cur, uint8
 }
 
 static void yadif_filter_line_c_16bit(uint8_t *dst8, uint8_t *prev8, uint8_t *cur8, uint8_t *next8, int w, int prefs, int mrefs, int parity, int mode) {
-    uint8_t *dst = (uint8_t *)dst8;
-    uint8_t *prev = (uint8_t *)prev8;
-    uint8_t *cur = (uint8_t *)cur8;
-    uint8_t *next = (uint8_t *)next8;
+    uint16_t *dst = (uint16_t *)dst8;
+    uint16_t *prev = (uint16_t *)prev8;
+    uint16_t *cur = (uint16_t *)cur8;
+    uint16_t *next = (uint16_t *)next8;
     int x;
     uint16_t *prev2= parity ? prev : cur ;
     uint16_t *next2= parity ? cur  : next;