This should fix the heap corruption that caused intermittent crashes
for patchwatcher.

caps.MaxTextureWidth / caps.MaxTextureHeight can potentially be very
large, which could cause a driver to run out of memory. Arguably the
driver shouldn't report such large limits, but there's no reason for
us to create a texture larger than 1024x1024 either.

wldap32: Return an error when ldap_parse_sort_control or ldap_parse_vlv_control is called with NULL control array.