Fix SkJpegUtility bug.

Change-Id: Iac0ac65dd87629e274b5985f2c21e21d7e673d17
diff --git a/src/images/SkJpegUtility.cpp b/src/images/SkJpegUtility.cpp
index a3a6bcd..ac65b9e 100644
--- a/src/images/SkJpegUtility.cpp
+++ b/src/images/SkJpegUtility.cpp
@@ -141,8 +141,8 @@
     if (copyStream) {
         fMemoryBaseSize = 0;
         fMemoryBase = sk_malloc_throw(bufferSize);
-        while ((len = stream->read(fMemoryBase + fMemoryBaseSize,
-                        bufferSize - fMemoryBaseSize)) != 0) {
+        while ((len = stream->read((char*)fMemoryBase + fMemoryBaseSize,
+                    bufferSize - fMemoryBaseSize)) != 0) {
             fMemoryBaseSize += len;
             if (fMemoryBaseSize == bufferSize) {
                 bufferSize *= 2;