wintrust: Increase buffer size to silence a gcc warning.

Signed-off-by: Alexandre Julliard <julliard@winehq.org>

dlls/wintrust/asn.c

@@ -1841,10 +1841,10 @@ static BOOL WINAPI CRYPT_AsnDecodeOidIgnoreTag(DWORD dwCertEncodingType,
             /* The largest possible string for the first two components
              * is 2.175 (= 2 * 40 + 175 = 255), so this is big enough.
              */
-            char firstTwo[6];
+            char firstTwo[8];
             const BYTE *ptr;
 
-            snprintf(firstTwo, sizeof(firstTwo), "%d.%d",
+            sprintf(firstTwo, "%d.%d",
              pbEncoded[1 + lenBytes] / 40,
              pbEncoded[1 + lenBytes] - (pbEncoded[1 + lenBytes] / 40)
              * 40);