ntdll: Fix NtQueryInformationToken(TokenGroups)

[Robert Shearman]

ChangeLog:
Fix the buffer check for NtQueryInformationToken(TokenGroups) so that it 
doesn't return STATUS_BUFFER_TOO_SMALL when it shouldn't. Use the same 
code for returning the required buffer and for calculating whether the 
buffer is sufficient so this can't happen again.

Add missing break statement (spotted by Dan Kegel).

  dlls/ntdll/nt.c |   21 ++++++++-------------
  1 files changed, 8 insertions(+), 13 deletions(-)

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