fix other printf warning for SkBlendMode

src/utils/SkDumpCanvas.cpp

Index: src/utils/SkDumpCanvas.cpp
diff --git a/src/utils/SkDumpCanvas.cpp b/src/utils/SkDumpCanvas.cpp
index eda23b7eb01c970ab86ba6b6bedec4c711f93b7a..eb5606845bd5da92a10aee4f95f2a2485461632b 100644
--- a/src/utils/SkDumpCanvas.cpp
+++ b/src/utils/SkDumpCanvas.cpp
@@ -541,7 +541,7 @@ void SkFormatDumper::dump(SkDumpCanvas* canvas, SkDumpCanvas::Verb verb,
     if (p) {
         msg.appendf(" color:0x%08X flags:%X", p->getColor(), p->getFlags());
         if (!p->isSrcOver()) {
-            msg.appendf(" blendmode:%d", p->getBlendMode());
+            msg.appendf(" blendmode:%d", (int)p->getBlendMode());
         }
         appendFlattenable(&msg, p->getShader(), "shader");
         appendFlattenable(&msg, p->getPathEffect(), "pathEffect");