[NTOSKRNL]

[NTOSKRNL]
Revert r51108. ProbeForRead doesn't check if memory is readable.
Improve comments and replace trick raising exception with call to ExRaiseAccessViolation.

[WIN32K]
Remove ASSERTs in IntSetSysColors: this function is only called in NtUserSetSysColors in SEH block. It shouldn't crash for NULL pointers.

svn path=/trunk/; revision=51126