fix warnings

BUG=skia:

Review URL: https://codereview.chromium.org/153003005

git-svn-id: http://skia.googlecode.com/svn/trunk@13392 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/core/SkBitmap.cpp b/src/core/SkBitmap.cpp
index eddfd31..9139f78 100644
--- a/src/core/SkBitmap.cpp
+++ b/src/core/SkBitmap.cpp
@@ -259,7 +259,7 @@
     if ((int32_t)mrb != mrb) {
         return reset_return_false(this);
     }
-    if ((ssize_t)rowBytes != (int32_t)rowBytes) {
+    if ((int64_t)rowBytes != (int32_t)rowBytes) {
         return reset_return_false(this);
     }
 
diff --git a/src/images/SkDecodingImageGenerator.cpp b/src/images/SkDecodingImageGenerator.cpp
index 96c9c30..1e28136 100644
--- a/src/images/SkDecodingImageGenerator.cpp
+++ b/src/images/SkDecodingImageGenerator.cpp
@@ -275,10 +275,6 @@
         info.fHeight = bitmap.height();
         info.fColorType = opts.fRequestedColorType;
         info.fAlphaType = bitmap.alphaType();
-
-        // Sanity check.
-        SkDEBUGCODE(SkColorType tmp;)
-        SkASSERT(tmp == opts.fRequestedColorType);
     }
     return SkNEW_ARGS(SkDecodingImageGenerator,
                       (data, autoStream.detach(), info,