swscale/rgb2rgb: Don't cast const away

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libswscale/rgb2rgb.c

@@ -317,7 +317,7 @@ void rgb15tobgr15(const uint8_t *src, uint8_t *dst, int src_size)
 void rgb12tobgr12(const uint8_t *src, uint8_t *dst, int src_size)
 {
     uint16_t *d = (uint16_t *)dst;
-    uint16_t *s = (uint16_t *)src;
+    const uint16_t *s = (const uint16_t *)src;
     int i, num_pixels = src_size >> 1;
 
     for (i = 0; i < num_pixels; i++) {
@@ -331,7 +331,7 @@ void rgb48tobgr48_ ## need_bswap(const uint8_t *src,                    \
                                  uint8_t *dst, int src_size)            \
 {                                                                       \
     uint16_t *d = (uint16_t *)dst;                                      \
-    uint16_t *s = (uint16_t *)src;                                      \
+    const uint16_t *s = (const uint16_t *)src;                          \
     int i, num_pixels = src_size >> 1;                                  \
                                                                         \
     for (i = 0; i < num_pixels; i += 3) {                               \
@@ -349,7 +349,7 @@ void rgb64tobgr48_ ## need_bswap(const uint8_t *src,                    \
                                  uint8_t *dst, int src_size)            \
 {                                                                       \
     uint16_t *d = (uint16_t *)dst;                                      \
-    uint16_t *s = (uint16_t *)src;                                      \
+    const uint16_t *s = (const uint16_t *)src;                          \
     int i, num_pixels = src_size >> 3;                                  \
                                                                         \
     for (i = 0; i < num_pixels; i++) {                                  \
@@ -367,7 +367,7 @@ void rgb64to48_ ## need_bswap(const uint8_t *src,                       \
                               uint8_t *dst, int src_size)               \
 {                                                                       \
     uint16_t *d = (uint16_t *)dst;                                      \
-    uint16_t *s = (uint16_t *)src;                                      \
+    const uint16_t *s = (const uint16_t *)src;                          \
     int i, num_pixels = src_size >> 3;                                  \
                                                                         \
     for (i = 0; i < num_pixels; i++) {                                  \
@@ -385,7 +385,7 @@ void rgb48tobgr64_ ## need_bswap(const uint8_t *src,                    \
                                  uint8_t *dst, int src_size)            \
 {                                                                       \
     uint16_t *d = (uint16_t *)dst;                                      \
-    uint16_t *s = (uint16_t *)src;                                      \
+    const uint16_t *s = (const uint16_t *)src;                          \
     int i, num_pixels = src_size / 6;                                   \
                                                                         \
     for (i = 0; i < num_pixels; i++) {                                  \
@@ -404,7 +404,7 @@ void rgb48to64_ ## need_bswap(const uint8_t *src,                       \
                               uint8_t *dst, int src_size)               \
 {                                                                       \
     uint16_t *d = (uint16_t *)dst;                                      \
-    uint16_t *s = (uint16_t *)src;                                      \
+    const uint16_t *s = (const uint16_t *)src;                          \
     int i, num_pixels = src_size / 6;                                   \
                                                                         \
     for (i = 0; i < num_pixels; i++) {                                  \