Sync listDbRoleSettings() with the rest of the world.

listDbRoleSettings() handled its server version check randomly differently
from every other comparable function in describe.c, not only as to code
layout but also message wording.  It also leaked memory, because its
PQExpBuffer management was also unlike everyplace else (and wrong).

Also fix an error-case leak in add_tablespace_footer().

In passing, standardize the format of function header comments in
describe.c --- we usually put "/*" alone on a line.

Daniel Gustafsson, memory leak fixes by me

Discussion: https://postgr.es/m/3641F19B-336A-431A-86CE-A80562505C5E@yesql.se

src/bin/psql/describe.c

@@ -54,7 +54,8 @@ static bool listOneExtensionContents(const char *extname, const char *oid);
  */
 
 
-/* \da
+/*
+ * \da
  * Takes an optional regexp to select particular aggregates
  */
 bool
@@ -131,7 +132,8 @@ describeAggregates(const char *pattern, bool verbose, bool showSystem)
 	return true;
 }
 
-/* \dA
+/*
+ * \dA
  * Takes an optional regexp to select particular access methods
  */
 bool
@@ -198,7 +200,8 @@ describeAccessMethods(const char *pattern, bool verbose)
 	return true;
 }
 
-/* \db
+/*
+ * \db
  * Takes an optional regexp to select particular tablespaces
  */
 bool
@@ -283,7 +286,8 @@ describeTablespaces(const char *pattern, bool verbose)
 }
 
 
-/* \df
+/*
+ * \df
  * Takes an optional regexp to select particular functions.
  *
  * As with \d, you can specify the kinds of functions you want:
@@ -696,7 +700,8 @@ describeTypes(const char *pattern, bool verbose, bool showSystem)
 }
 
 
-/* \do
+/*
+ * \do
  * Describe operators
  */
 bool
@@ -2997,7 +3002,10 @@ add_tablespace_footer(printTableContent *const cont, char relkind,
 							  "WHERE oid = '%u';", tablespace);
 			result = PSQLexec(buf.data);
 			if (!result)
+			{
+				termPQExpBuffer(&buf);
 				return;
+			}
 			/* Should always be the case, but.... */
 			if (PQntuples(result) > 0)
 			{
@@ -3209,12 +3217,19 @@ listDbRoleSettings(const char *pattern, const char *pattern2)
 	PQExpBufferData buf;
 	PGresult   *res;
 	printQueryOpt myopt = pset.popt;
+	bool		havewhere;
 
-	initPQExpBuffer(&buf);
-
-	if (pset.sversion >= 90000)
+	if (pset.sversion < 90000)
 	{
-		bool		havewhere;
+		char		sverbuf[32];
+
+		psql_error("The server (version %s) does not support per-database role settings.\n",
+				   formatPGVersionNumber(pset.sversion, false,
+										 sverbuf, sizeof(sverbuf)));
+		return true;
+	}
+
+	initPQExpBuffer(&buf);
 
 	printfPQExpBuffer(&buf, "SELECT rolname AS \"%s\", datname AS \"%s\",\n"
 					  "pg_catalog.array_to_string(setconfig, E'\\n') AS \"%s\"\n"
@@ -3229,15 +3244,9 @@ listDbRoleSettings(const char *pattern, const char *pattern2)
 	processSQLNamePattern(pset.db, &buf, pattern2, havewhere, false,
 						  NULL, "d.datname", NULL, NULL);
 	appendPQExpBufferStr(&buf, "ORDER BY 1, 2;");
-	}
-	else
-	{
-		fprintf(pset.queryFout,
-				_("No per-database role settings support in this server version.\n"));
-		return false;
-	}
 
 	res = PSQLexec(buf.data);
+	termPQExpBuffer(&buf);
 	if (!res)
 		return false;
 
@@ -3258,7 +3267,6 @@ listDbRoleSettings(const char *pattern, const char *pattern2)
 	}
 
 	PQclear(res);
-	resetPQExpBuffer(&buf);
 	return true;
 }
 
@@ -5024,7 +5032,8 @@ listOneExtensionContents(const char *extname, const char *oid)
 	return true;
 }
 
-/* \dRp
+/*
+ * \dRp
  * Lists publications.
  *
  * Takes an optional regexp to select particular publications
@@ -5090,7 +5099,8 @@ listPublications(const char *pattern)
 	return true;
 }
 
-/* \dRp+
+/*
+ * \dRp+
  * Describes publications including the contents.
  *
  * Takes an optional regexp to select particular publications
@@ -5211,7 +5221,8 @@ describePublications(const char *pattern)
 	return true;
 }
 
-/* \dRs
+/*
+ * \dRs
  * Describes subscriptions.
  *
  * Takes an optional regexp to select particular subscriptions