Factorize error message logging, log it if the converter cannot be

set.

Originally committed as revision 30360 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale

libswscale/swscale.c

@@ -2032,10 +2032,7 @@ static int pal2rgbWrapper(SwsContext *c, const uint8_t* src[], int srcStride[],
     uint8_t *dstPtr= dst[0] + dstStride[0]*srcSliceY;
     const uint8_t *srcPtr= src[0];
 
-    if (!usePal(srcFormat))
-        av_log(c, AV_LOG_ERROR, "internal error %s -> %s converter\n",
-               sws_format_name(srcFormat), sws_format_name(dstFormat));
-    else {
+    if (usePal(srcFormat)) {
         switch (dstFormat) {
         case PIX_FMT_RGB32  : conv = palette8topacked32; break;
         case PIX_FMT_BGR32  : conv = palette8topacked32; break;
@@ -2043,17 +2040,19 @@ static int pal2rgbWrapper(SwsContext *c, const uint8_t* src[], int srcStride[],
         case PIX_FMT_RGB32_1: conv = palette8topacked32; break;
         case PIX_FMT_RGB24  : conv = palette8topacked24; break;
         case PIX_FMT_BGR24  : conv = palette8topacked24; break;
-        default: av_log(c, AV_LOG_ERROR, "internal error %s -> %s converter\n",
-                        sws_format_name(srcFormat), sws_format_name(dstFormat)); break;
         }
     }
 
-    if (conv)
+    if (!conv)
+        av_log(c, AV_LOG_ERROR, "internal error %s -> %s converter\n",
+               sws_format_name(srcFormat), sws_format_name(dstFormat));
+    else {
         for (i=0; i<srcSliceH; i++) {
             conv(srcPtr, dstPtr, c->srcW, (uint8_t *) c->pal_rgb);
             srcPtr+= srcStride[0];
             dstPtr+= dstStride[0];
         }
+    }
 
     return srcSliceH;
 }