dwrite: Avoid signed-unsigned integer comparisons.

dlls/dwrite/analyzer.c

@@ -211,7 +211,7 @@ static const struct script_range script_ranges[] = {
 static UINT16 get_char_script( WCHAR c )
 {
     DWORD ch = c;
-    int i;
+    unsigned int i;
 
     for (i = 0; i < sizeof(script_ranges)/sizeof(struct script_range); i++)
     {

dlls/dwrite/font.c

@@ -288,7 +288,7 @@ static HRESULT WINAPI dwritefontface_GetGlyphIndices(IDWriteFontFace *iface, UIN
     HFONT hfont;
     WCHAR *str;
     HDC hdc;
-    int i;
+    unsigned int i;
 
     TRACE("(%p)->(%p %u %p)\n", This, codepoints, count, glyph_indices);
 
@@ -783,7 +783,7 @@ static INT CALLBACK enum_font_families(const LOGFONTW *lf, const TEXTMETRICW *tm
 static void release_font_collection(IDWriteFontCollection *iface)
 {
     struct dwrite_fontcollection *This = impl_from_IDWriteFontCollection(iface);
-    int i;
+    unsigned int i;
 
     for (i = 0; i < This->count; i++)
         heap_free(This->families[i]);

dlls/dwrite/main.c

@@ -228,7 +228,7 @@ static ULONG WINAPI localizedstrings_Release(IDWriteLocalizedStrings *iface)
     TRACE("(%p)->(%d)\n", This, ref);
 
     if (!ref) {
-        int i;
+        unsigned int i;
 
         for (i = 0; i < This->count; i++) {
             heap_free(This->data[i].locale);