More work to make libRS buildable on the host.

Change-Id: I239585ef7c1334f7fc19fa6423535dea7b9a753f
diff --git a/libs/rs/rsFifoSocket.cpp b/libs/rs/rsFifoSocket.cpp
index 848bba5..8b8008d 100644
--- a/libs/rs/rsFifoSocket.cpp
+++ b/libs/rs/rsFifoSocket.cpp
@@ -70,9 +70,9 @@
 }
 
 void FifoSocket::readReturn(const void *data, size_t bytes) {
-    LOGE("readReturn %p %i", data, bytes);
+    LOGE("readReturn %p %Zu", data, bytes);
     size_t ret = ::send(sv[1], data, bytes, 0);
-    LOGE("readReturn %i", ret);
+    LOGE("readReturn %Zu", ret);
     rsAssert(ret == bytes);
 }