d3dx9_36: Use debugstr_fourcc instead of debugstr_an.

dlls/d3dx9_36/util.c

@@ -214,7 +214,7 @@ const struct pixel_format_desc *get_format_info(D3DFORMAT format)
     unsigned int i = 0;
     while(formats[i].format != format && formats[i].format != D3DFMT_UNKNOWN) i++;
     if (formats[i].format == D3DFMT_UNKNOWN)
-        FIXME("Unknown format %#x (as FOURCC %s).\n", format, debugstr_an((const char *)&format, 4));
+        FIXME("Unknown format %s.\n", debugstr_fourcc(format));
     return &formats[i];
 }