RFR(S): 8196909: gcc 7.2.1 compiler warning in libdt_socket

[Chris Plummer]

Hello,

Please review the following simple fix for a compiler warning:

https://bugs.openjdk.java.net/browse/JDK-8196909

diff --git 
a/src/jdk.jdwp.agent/share/native/libdt_socket/socketTransport.c 
b/src/jdk.jdwp.agent/share/native/libdt_socket/socketTransport.c
--- a/src/jdk.jdwp.agent/share/native/libdt_socket/socketTransport.c
+++ b/src/jdk.jdwp.agent/share/native/libdt_socket/socketTransport.c
@@ -398,7 +398,7 @@
         return instr;
      }

-    *mask = htonl(-1 << (32 - m));
+    *mask = htonl((uint32_t)(~0) << (32 - m));
      return s;
  }


Tested with all open and closed jdb, jdwp, and jdi test suites on all 
supported platforms.

thanks,

Chris