dinput: Fix printing NULL strings.

[Francois Gouget]

---

This lets the test complete without crashing on my Solaris VMs.

 dlls/dinput/dinput_main.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/dlls/dinput/dinput_main.c b/dlls/dinput/dinput_main.c
index 028d901..373b990 100644
--- a/dlls/dinput/dinput_main.c
+++ b/dlls/dinput/dinput_main.c
@@ -883,7 +883,7 @@ static HRESULT WINAPI IDirectInput8AImpl_EnumDevicesBySemantics(
     int i, j;
 
 
-    FIXME("(this=%p,%s,%p,%p,%p,%04x): semi-stub\n", This, ptszUserName, lpdiActionFormat,
+    FIXME("(this=%p,%s,%p,%p,%p,%04x): semi-stub\n", This, debugstr_a(ptszUserName), lpdiActionFormat,
           lpCallback, pvRef, dwFlags);
 #define X(x) if (dwFlags & x) FIXME("\tdwFlags |= "#x"\n");
 	X(DIEDBSFL_ATTACHEDONLY)
-- 
1.7.5.4