urlmon: Cast-qual warnings fix (2 of 2)

[Andrew Talbot]

Changelog:
    urlmon: Cast-qual warning fix.

diff -urN a/dlls/urlmon/urlmon_main.c b/dlls/urlmon/urlmon_main.c
--- a/dlls/urlmon/urlmon_main.c	2006-10-24 17:31:34.000000000 +0100
+++ b/dlls/urlmon/urlmon_main.c	2006-11-16 21:46:39.000000000 +0000
@@ -452,7 +452,7 @@
 {
     return size >= 14
         && b[0] == 0x42 && b[1] == 0x4d
-        && *(DWORD*)(b+6) == 0;
+        && *(const DWORD *)(b+6) == 0;
 }
 
 static BOOL video_avi_filter(const BYTE const *b, DWORD size)