[ntdll][1/3] Fix possible TRACE crash

[Paul Vriens]

Hi,

running the tests with WINEDEBUG=+reg crashes Wine.

Changelog
  Fix possible TRACE crash

Cheers,

Paul.
---
 dlls/ntdll/reg.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/dlls/ntdll/reg.c b/dlls/ntdll/reg.c
index 5a1f5c2..c88bc1f 100644
--- a/dlls/ntdll/reg.c
+++ b/dlls/ntdll/reg.c
@@ -55,7 +55,8 @@ NTSTATUS WINAPI NtCreateKey( PHANDLE ret
 {
     NTSTATUS ret;
 
-    TRACE( "(%p,%s,%s,%lx,%lx,%p)\n", attr->RootDirectory, debugstr_us(attr->ObjectName),
+    TRACE( "(%p,%s,%s,%lx,%lx,%p)\n", (attr) ? attr->RootDirectory : NULL,
+           (attr) ? debugstr_us(attr->ObjectName) : NULL,
            debugstr_us(class), options, access, retkey );
 
     if (!retkey || !attr) return STATUS_ACCESS_VIOLATION;
-- 
1.4.1
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