Simplify if() in copy_and_dup()

Originally committed as revision 15268 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/ra144.c

@@ -109,13 +109,10 @@ static void copy_and_dup(int16_t *target, const int16_t *source, int offset)
 {
     source += BUFFERSIZE - offset;
 
-    if (offset > BLOCKSIZE) {
+    memcpy(target, source, FFMIN(BLOCKSIZE, offset)*sizeof(*target));
-        memcpy(target, source, BLOCKSIZE*sizeof(*target));
+    if (offset < BLOCKSIZE)
-    } else {
-        memcpy(target, source, offset*sizeof(*target));
         memcpy(target + offset, source, (BLOCKSIZE - offset)*sizeof(*target));
 }
-}
 
 /** inverse root mean square */
 static int irms(const int16_t *data)