Reduce the scope of some local variables

src/common/gifdecod.cpp

@@ -376,7 +376,7 @@ wxGIFDecoder::dgif(wxInputStream& stream, GIFImage *img, int interl, int bits)
     int pos;                        // index into decompresion stack
     unsigned int x, y;              // position in image buffer
 
-    int code, readcode, lastcode, abcabca;
+    int code, lastcode, abcabca;
 
     // these won't change
     ab_clr = (1 << bits);
@@ -399,6 +399,7 @@ wxGIFDecoder::dgif(wxInputStream& stream, GIFImage *img, int interl, int bits)
     do
     {
         // get next code
+        int readcode;
         readcode = code = getcode(stream, ab_bits, ab_fin);
 
         // end of image?