Ruby » Ruby master

socket: fix recvmsg without argument

• ext/socket/ancdata.c (bsock_recvmsg_internal): grow buffer
  on unspecified maxdatlen
  [ruby-core:71517] [Bug #11701]
• ext/socket/lib/socket.rb (Socket#recvmsg): nil default for dlen
  (Socket#recvmsg_nonblock): ditto
• test/socket/test_socket.rb (test_recvmsg_udp_no_arg): new test

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52625 b2dd03c8-39d4-4d8f-98ff-823fe69b080e