Merge declaratio and initialization.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@12677 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavutil/mem.c

@@ -140,8 +140,7 @@ void *av_mallocz(unsigned int size)
 char *av_strdup(const char *s)
 {
     char *ptr;
-    int len;
-    len = strlen(s) + 1;
+    int len = strlen(s) + 1;
     ptr = av_malloc(len);
     if (ptr)
         memcpy(ptr, s, len);