Fix Mac build. Usual %d versus %zd nonsense.

Change-Id: I3bf51c9caf215e3731f7c7ae0b8fab5b6db5a45d
diff --git a/src/debugger.cc b/src/debugger.cc
index 553c3cb..0b76e8a 100644
--- a/src/debugger.cc
+++ b/src/debugger.cc
@@ -1512,7 +1512,7 @@
         JDWP::FrameId frame_id(GetFrameId());
         JDWP::JdwpLocation location;
         SetLocation(location, GetMethod(), GetDexPc());
-        VLOG(jdwp) << StringPrintf("    Frame %3d: id=%3lld ", depth_, frame_id) << location;
+        VLOG(jdwp) << StringPrintf("    Frame %3zd: id=%3lld ", depth_, frame_id) << location;
         expandBufAdd8BE(buf_, frame_id);
         expandBufAddLocation(buf_, location);
       }