[PATCH] ntdll: Check context is NULL in NtGetContextThread.

[Johannes Brandstätter]

Crash Bandicoot N. Sane Trilogy calls NtGetContextThread
with the context being set to NULL which leads to a crash.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=45428

Signed-off-by: Johannes Brandstätter <jbrandst at 2ds.eu>
---
 dlls/ntdll/signal_x86_64.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)
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