[PATCH] psql : Improve code for help option

[miyake_kouta]

Hi.

I found some redundant code in psql/help.c, so I propose a patch to fix 
it.
In the current help.c, the variable "user" is set to the value of 
$PGUSER (or get_user_name).
However, $PGUSER is referenced again in the code that follows.
We can replace this part with "user", I think.
Regards.
--
Kota Miyakediff --git a/src/bin/psql/help.c b/src/bin/psql/help.c
index e44120bf76..75a2217cac 100644
--- a/src/bin/psql/help.c
+++ b/src/bin/psql/help.c
@@ -134,9 +134,7 @@ usage(unsigned short int pager)
 	fprintf(output, _("  -p, --port=PORT          database server port (default: \"%s\")\n"),
 			env ? env : DEF_PGPORT_STR);
 	/* Display default user */
-	env = getenv("PGUSER");
-	if (!env)
-		env = user;
+	env = user;
 	fprintf(output, _("  -U, --username=USERNAME  database user name (default: \"%s\")\n"), env);
 	fprintf(output, _("  -w, --no-password        never prompt for password\n"));
 	fprintf(output, _("  -W, --password           force password prompt (should happen automatically)\n"));