Switch SkAutoMalloc to SkAutoTMalloc to avoid cast

src/codec/SkJpegCodec.h

Index: src/codec/SkJpegCodec.h
diff --git a/src/codec/SkJpegCodec.h b/src/codec/SkJpegCodec.h
index ed94b613f9fcbd2374cc6b171738d45b01fac6b0..8e2db81b73a1ff8f1a6b6a6407721d44ce089313 100644
--- a/src/codec/SkJpegCodec.h
+++ b/src/codec/SkJpegCodec.h
@@ -13,6 +13,7 @@
 #include "SkJpegDecoderMgr.h"
 #include "SkJpegUtility_codec.h"
 #include "SkStream.h"
+#include "SkTemplates.h"
 
 extern "C" {
     #include "jpeglib.h"
@@ -111,7 +112,7 @@ private:
     const int                     fReadyState;
 
     // scanline decoding
-    SkAutoMalloc               fStorage;    // Only used if sampling is needed
+    SkAutoTMalloc<uint8_t>     fStorage;    // Only used if sampling is needed
     uint8_t*                   fSrcRow;     // Only used if sampling is needed
     SkAutoTDelete<SkSwizzler>  fSwizzler;