swscale: rename sws_rgb2rgb_init to ff_sws_rgb2rgb_init

It is an internal swscale function and thus should not be exported.
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>

libswscale/colorspace-test.c

@@ -45,7 +45,7 @@ int main(int argc, char **argv)
         return -1;
 
     av_log(NULL, AV_LOG_INFO, "memory corruption test ...\n");
-    sws_rgb2rgb_init();
+    ff_sws_rgb2rgb_init();
 
     for (funcNum = 0; ; funcNum++) {
         struct func_info_s {

libswscale/rgb2rgb.c

@@ -130,7 +130,7 @@ void (*yuyvtoyuv422)(uint8_t *ydst, uint8_t *udst, uint8_t *vdst,
  * 32-bit C version, and and&add trick by Michael Niedermayer
  */
 
-av_cold void sws_rgb2rgb_init(void)
+av_cold void ff_sws_rgb2rgb_init(void)
 {
     rgb2rgb_init_c();
     if (ARCH_X86)

libswscale/rgb2rgb.h

@@ -164,7 +164,7 @@ extern void (*yuyvtoyuv422)(uint8_t *ydst, uint8_t *udst, uint8_t *vdst, const u
                             int width, int height,
                             int lumStride, int chromStride, int srcStride);
 
-void sws_rgb2rgb_init(void);
+void ff_sws_rgb2rgb_init(void);
 
 void rgb2rgb_init_x86(void);
 

libswscale/utils.c

@@ -1127,7 +1127,7 @@ av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,
     flags     = c->flags;
     emms_c();
     if (!rgb15to16)
-        sws_rgb2rgb_init();
+        ff_sws_rgb2rgb_init();
 
     unscaled = (srcW == dstW && srcH == dstH);