winmm/tests: Use '%u' to print GetLastError().

dlls/winmm/tests/timer.c

diff --git a/dlls/winmm/tests/timer.c b/dlls/winmm/tests/timer.c
index 22ce81d..7ac86b9 100644
--- a/dlls/winmm/tests/timer.c
+++ b/dlls/winmm/tests/timer.c
@@ -167,7 +167,7 @@
                                       DWORD_PTR dw1, DWORD_PTR dw2)
 {
     priority = GetThreadPriority(GetCurrentThread());
-    ok(priority!=THREAD_PRIORITY_ERROR_RETURN, "GetThreadPriority() failed, GetLastError() = %08x\n", GetLastError());
+    ok(priority!=THREAD_PRIORITY_ERROR_RETURN, "GetThreadPriority() failed, GetLastError() = %u\n", GetLastError());
     fired = TRUE;
 }