Remove more lint.

Change-Id: I48714db4169d9ea0536342809361210910ee2091
diff --git a/src/dex_instruction.cc b/src/dex_instruction.cc
index 029c68b..e56492a 100644
--- a/src/dex_instruction.cc
+++ b/src/dex_instruction.cc
@@ -189,7 +189,7 @@
       vB_wide = FETCH_u4(1) | ((uint64_t) FETCH_u4(3) << 32);
       break;
     default:
-      LOG(ERROR) << "Can't decode unexpected format " << (int) Format() << " (op=" << opcode << ")";
+      LOG(ERROR) << "Can't decode unexpected format " << static_cast<int>(Format()) << " (op=" << opcode << ")";
       return;
   }
 }