Spelling, trace fixes.

diff --git a/windows/nonclient.c b/windows/nonclient.c
index 942c0d3..7d930d0 100644
--- a/windows/nonclient.c
+++ b/windows/nonclient.c
@@ -667,7 +667,7 @@
 /***********************************************************************
  * NC_DoNCHitTest
  *
- * Handle a WM_NCHITTEST message. Called from NC_HandleNcHitTest().
+ * Handle a WM_NCHITTEST message. Called from NC_HandleNCHitTest().
  */
 
 static LONG NC_DoNCHitTest (WND *wndPtr, POINT16 pt )