fix signed mismatch

tools/sk_tool_utils_font.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Resources.h"
 #include "SkOSFile.h"
 #include "SkTestScalerContext.h"
 #include "SkThread.h"
 #include "SkUtils.h"
 #include "sk_tool_utils.h"
 
 namespace sk_tool_utils {
 
 #include "test_font_data.cpp"
 
 static void release_portable_typefaces() {
     // We'll clean this up in our own tests, but disable for clients.
     // Chrome seems to have funky multi-process things going on in unit tests that
     // makes this unsafe to delete when the main process atexit()s.
     // SkLazyPtr does the same sort of thing.
 #if SK_DEVELOPER
-    for (unsigned index = 0; index < gTestFontsCount; ++index) {
+    for (int index = 0; index < gTestFontsCount; ++index) {
         SkTestFontData& fontData = gTestFonts[index];
         SkSafeUnref(fontData.fFontCache);
     }
 #endif
 }
 
 SK_DECLARE_STATIC_MUTEX(gTestFontMutex);
 
 SkTypeface* create_font(const char* name, SkTypeface::Style style) {
     SkTestFontData* fontData = NULL;
     const SubFont* sub;
     if (name) {
-        for (unsigned index = 0; index < gSubFontsCount; ++index) {
+        for (int index = 0; index < gSubFontsCount; ++index) {
             sub = &gSubFonts[index];
             if (!strcmp(name, sub->fName) && sub->fStyle == style) {
                 fontData = &sub->fFont;
                 break;
             }
         }
         if (!fontData) {
             SkDebugf("missing %s %d\n", name, style);
             return SkTypeface::CreateFromName(name, style);
         }
@@ skipping 14 matching lines @@
             atexit(release_portable_typefaces);
         }
     }
     return SkNEW_ARGS(SkTestTypeface, (font, style));
 }
 
 
 SkTypeface* resource_font(const char* name, SkTypeface::Style style) {
     const char* file = NULL;
     if (name) {
-        for (unsigned index = 0; index < gSubFontsCount; ++index) {
+        for (int index = 0; index < gSubFontsCount; ++index) {
             const SubFont& sub = gSubFonts[index];
             if (!strcmp(name, sub.fName) && sub.fStyle == style) {
                 file = sub.fFile;
                 break;
             }
         }
         if (!file) {
             return SkTypeface::CreateFromName(name, style);
         }
     } else {
@@ skipping 85 matching lines @@
                 break;
             }
         }
        fprintf(out, ";\n");
     }
     fclose(out);
 }
 #endif
 
 }