fix warning from scalar --> int32 conversion

BUG=

Review URL: https://codereview.appspot.com/7065050

git-svn-id: http://skia.googlecode.com/svn/trunk@7061 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/aaclip.cpp b/gm/aaclip.cpp
index b74f6d3..10bfdf4 100644
--- a/gm/aaclip.cpp
+++ b/gm/aaclip.cpp
@@ -36,11 +36,14 @@
     return canvas;
 }
 
+#ifdef SK_DEBUG
 static void GetBitmap(const SkCanvas* canvas, SkBitmap* bm) {
     *bm = canvas->getDevice()->accessBitmap(false);
 }
+#endif
 
 static void compare_canvas(const SkCanvas* a, const SkCanvas* b) {
+#ifdef SK_DEBUG
     SkBitmap bma, bmb;
     GetBitmap(a, &bma);
     GetBitmap(b, &bmb);
@@ -60,6 +63,7 @@
             SkASSERT(0xFF000000 == rowb[x]);
         }
     }
+#endif
 }
 
 static void drawRectAsPath(SkCanvas* canvas, const SkRect& r, const SkPaint& p) {
diff --git a/gm/bigmatrix.cpp b/gm/bigmatrix.cpp
index 31c0a38..deaf448 100644
--- a/gm/bigmatrix.cpp
+++ b/gm/bigmatrix.cpp
@@ -41,6 +41,7 @@
 
         bool success = m.invert(&m);
         SkASSERT(success);
+        (void) success; // silence compiler :(
 
         SkPath path;
 
diff --git a/gm/bitmapscroll.cpp b/gm/bitmapscroll.cpp
index eee9668..a1c0ce4 100644
--- a/gm/bitmapscroll.cpp
+++ b/gm/bitmapscroll.cpp
@@ -131,10 +131,10 @@
                 // Scroll a new copy of the bitmap, and then draw it.
                 // scrollRect() should always return true, even if it's a no-op
                 SkBitmap scrolledBitmap;
-                bool copyToReturnValue = origBitmap.copyTo(
+                SkDEBUGCODE(bool copyToReturnValue = )origBitmap.copyTo(
                     &scrolledBitmap, origBitmap.config());
                 SkASSERT(copyToReturnValue);
-                bool scrollRectReturnValue = scrolledBitmap.scrollRect(
+                SkDEBUGCODE(bool scrollRectReturnValue = )scrolledBitmap.scrollRect(
                     subset, scrollX * xMult, scrollY * yMult);
                 SkASSERT(scrollRectReturnValue);
                 canvas->drawBitmap(scrolledBitmap, bitmapX, bitmapY);
diff --git a/gm/cmykjpeg.cpp b/gm/cmykjpeg.cpp
index 692bc3e..7ac4259 100644
--- a/gm/cmykjpeg.cpp
+++ b/gm/cmykjpeg.cpp
@@ -67,7 +67,7 @@
 void forceLinking();
 
 void forceLinking() {
-    SkImageDecoder *creator = CreateJPEGImageDecoder();
+    SkDEBUGCODE(SkImageDecoder *creator = ) CreateJPEGImageDecoder();
     SkASSERT(creator);
 }