pg_upgrade: revert changing '' to ""

On the command line, GUC option strings are handled by the guc parser,
not by the shell parser, so '' is the proper way to represent a
zero-length string.  This reverts commit
3132a9b7ab3d76c15f88cfa29792fd888e7a959e.

diff --git a/contrib/pg_upgrade/server.c b/contrib/pg_upgrade/server.c
index 7e972315f8ecc1357664a8ad5f511298472bdeb3..c1d459dd8220e79def97d220a4e3814a1634ad04 100644 (file)
--- a/contrib/pg_upgrade/server.c
+++ b/contrib/pg_upgrade/server.c
@@ -190,7 +190,7 @@ start_postmaster(ClusterInfo *cluster, bool throw_error)
 #ifdef HAVE_UNIX_SOCKETS
    /* prevent TCP/IP connections, restrict socket access */
    strcat(socket_string,
-          " -c listen_addresses=\"\" -c unix_socket_permissions=0700");
+          " -c listen_addresses='' -c unix_socket_permissions=0700");
 
    /* Have a sockdir?  Tell the postmaster. */
    if (cluster->sockdir)