xmlrpcpp: Fix compiler warnings

BUG: 28475384
Change-Id: I7a15bd620c21383d8d1776e9cce0aa10d792b1df
diff --git a/src/XmlRpcClient.cpp b/src/XmlRpcClient.cpp
index e0b9da9..b8f6b4e 100644
--- a/src/XmlRpcClient.cpp
+++ b/src/XmlRpcClient.cpp
@@ -249,7 +249,7 @@
   header += buff;
   header += "Content-Type: text/xml\r\nContent-length: ";
 
-  sprintf(buff,"%d\r\n\r\n", body.size());
+  sprintf(buff,"%d\r\n\r\n", (int)body.size());
 
   return header + buff;
 }
diff --git a/src/XmlRpcServerConnection.cpp b/src/XmlRpcServerConnection.cpp
index af00f97..17836ed 100644
--- a/src/XmlRpcServerConnection.cpp
+++ b/src/XmlRpcServerConnection.cpp
@@ -347,7 +347,7 @@
     "Content-length: ";
 
   char buffLen[40];
-  sprintf(buffLen,"%d\r\n\r\n", body.size());
+  sprintf(buffLen,"%d\r\n\r\n", (int)body.size());
 
   return header + buffLen;
 }