hhctrl.ocx: Avoid signed-unsigned integer comparisons

[Andrew Talbot]

Changelog:
    hhctrl.ocx: Avoid signed-unsigned integer comparisons.

diff --git a/dlls/hhctrl.ocx/help.c b/dlls/hhctrl.ocx/help.c
index 5c922b3..05e6466 100644
--- a/dlls/hhctrl.ocx/help.c
+++ b/dlls/hhctrl.ocx/help.c
@@ -1825,7 +1825,7 @@ void ReleaseHelpViewer(HHInfo *info)
 HHInfo *CreateHelpViewer(HHInfo *info, LPCWSTR filename, HWND caller)
 {
     HHInfo *tmp_info;
-    int i;
+    unsigned int i;
 
     if(!info)
     {
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