ntdll: Assert when trying to replace an exiting file descriptor in fd_cache.

[Sebastian Lackner]

The condition "prev_fd != -1" should never be true. If this is the case then something
is going terrible wrong, and it is better to assert instead of just closing the file
descriptor.

---
 dlls/ntdll/server.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)
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