remove useless casts

Originally committed as revision 26944 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale

libswscale/rgb2rgb.c

@@ -372,7 +372,7 @@ void rgb24tobgr32(const uint8_t *src, uint8_t *dst, long src_size)
 void rgb16tobgr32(const uint8_t *src, uint8_t *dst, long src_size)
 {
     const uint16_t *end;
-    uint8_t *d = (uint8_t *)dst;
+    uint8_t *d = dst;
     const uint16_t *s = (const uint16_t *)src;
     end = s + src_size/2;
     while (s < end)
@@ -396,7 +396,7 @@ void rgb16tobgr32(const uint8_t *src, uint8_t *dst, long src_size)
 void rgb16tobgr24(const uint8_t *src, uint8_t *dst, long src_size)
 {
     const uint16_t *end;
-    uint8_t *d = (uint8_t *)dst;
+    uint8_t *d = dst;
     const uint16_t *s = (const uint16_t *)src;
     end = s + src_size/2;
     while (s < end)
@@ -446,7 +446,7 @@ void rgb16tobgr15(const uint8_t *src, uint8_t *dst, long src_size)
 void rgb15tobgr32(const uint8_t *src, uint8_t *dst, long src_size)
 {
     const uint16_t *end;
-    uint8_t *d = (uint8_t *)dst;
+    uint8_t *d = dst;
     const uint16_t *s = (const uint16_t *)src;
     end = s + src_size/2;
     while (s < end)
@@ -470,7 +470,7 @@ void rgb15tobgr32(const uint8_t *src, uint8_t *dst, long src_size)
 void rgb15tobgr24(const uint8_t *src, uint8_t *dst, long src_size)
 {
     const uint16_t *end;
-    uint8_t *d = (uint8_t *)dst;
+    uint8_t *d = dst;
     const uint16_t *s = (const uint16_t *)src;
     end = s + src_size/2;
     while (s < end)