pg_dump: Fix some minor memory leaks

Although we often don't care about freeing all memory in pg_dump,
these functions already freed the same memory in other code paths, so
we might as well do it consistently.

found by Coverity

src/bin/pg_dump/pg_dump.c

@@ -3169,7 +3169,7 @@ getCollations(Archive *fout, int *numCollations)
 	PGresult   *res;
 	int			ntups;
 	int			i;
-	PQExpBuffer query = createPQExpBuffer();
+	PQExpBuffer query;
 	CollInfo   *collinfo;
 	int			i_tableoid;
 	int			i_oid;
@@ -3184,6 +3184,8 @@ getCollations(Archive *fout, int *numCollations)
 		return NULL;
 	}
 
+	query = createPQExpBuffer();
+
 	/*
 	 * find all collations, including builtin collations; we filter out
 	 * system-defined collations at dump-out time.
@@ -6167,7 +6169,7 @@ getTSParsers(Archive *fout, int *numTSParsers)
 	PGresult   *res;
 	int			ntups;
 	int			i;
-	PQExpBuffer query = createPQExpBuffer();
+	PQExpBuffer query;
 	TSParserInfo *prsinfo;
 	int			i_tableoid;
 	int			i_oid;
@@ -6186,6 +6188,8 @@ getTSParsers(Archive *fout, int *numTSParsers)
 		return NULL;
 	}
 
+	query = createPQExpBuffer();
+
 	/*
 	 * find all text search objects, including builtin ones; we filter out
 	 * system-defined objects at dump-out time.
@@ -6257,7 +6261,7 @@ getTSDictionaries(Archive *fout, int *numTSDicts)
 	PGresult   *res;
 	int			ntups;
 	int			i;
-	PQExpBuffer query = createPQExpBuffer();
+	PQExpBuffer query;
 	TSDictInfo *dictinfo;
 	int			i_tableoid;
 	int			i_oid;
@@ -6274,6 +6278,8 @@ getTSDictionaries(Archive *fout, int *numTSDicts)
 		return NULL;
 	}
 
+	query = createPQExpBuffer();
+
 	/* Make sure we are in proper schema */
 	selectSourceSchema(fout, "pg_catalog");
 
@@ -6340,7 +6346,7 @@ getTSTemplates(Archive *fout, int *numTSTemplates)
 	PGresult   *res;
 	int			ntups;
 	int			i;
-	PQExpBuffer query = createPQExpBuffer();
+	PQExpBuffer query;
 	TSTemplateInfo *tmplinfo;
 	int			i_tableoid;
 	int			i_oid;
@@ -6356,6 +6362,8 @@ getTSTemplates(Archive *fout, int *numTSTemplates)
 		return NULL;
 	}
 
+	query = createPQExpBuffer();
+
 	/* Make sure we are in proper schema */
 	selectSourceSchema(fout, "pg_catalog");
 
@@ -6415,7 +6423,7 @@ getTSConfigurations(Archive *fout, int *numTSConfigs)
 	PGresult   *res;
 	int			ntups;
 	int			i;
-	PQExpBuffer query = createPQExpBuffer();
+	PQExpBuffer query;
 	TSConfigInfo *cfginfo;
 	int			i_tableoid;
 	int			i_oid;
@@ -6431,6 +6439,8 @@ getTSConfigurations(Archive *fout, int *numTSConfigs)
 		return NULL;
 	}
 
+	query = createPQExpBuffer();
+
 	/* Make sure we are in proper schema */
 	selectSourceSchema(fout, "pg_catalog");
 
@@ -9467,16 +9477,18 @@ dumpCast(Archive *fout, CastInfo *cast)
 			appendPQExpBuffer(defqry, "WITH INOUT");
 			break;
 		case COERCION_METHOD_FUNCTION:
+		{
+			char   *fsig = format_function_signature(fout, funcInfo, true);
 
 			/*
 			 * Always qualify the function name, in case it is not in
 			 * pg_catalog schema (format_function_signature won't qualify it).
 			 */
-			appendPQExpBuffer(defqry, "WITH FUNCTION %s.",
-							  fmtId(funcInfo->dobj.namespace->dobj.name));
-			appendPQExpBuffer(defqry, "%s",
-						  format_function_signature(fout, funcInfo, true));
+			appendPQExpBuffer(defqry, "WITH FUNCTION %s.%s",
+							  fmtId(funcInfo->dobj.namespace->dobj.name), fsig);
+			free(fsig);
 			break;
+		}
 		default:
 			write_msg(NULL, "WARNING: bogus value in pg_cast.castmethod field\n");
 	}

src/bin/pg_dump/pg_dumpall.c

@@ -1525,12 +1525,17 @@ makeAlterConfigCommand(PGconn *conn, const char *arrayitem,
 {
 	char	   *pos;
 	char	   *mine;
-	PQExpBuffer buf = createPQExpBuffer();
+	PQExpBuffer buf;
 
 	mine = pg_strdup(arrayitem);
 	pos = strchr(mine, '=');
 	if (pos == NULL)
+	{
+		free(mine);
 		return;
+	}
+
+	buf = createPQExpBuffer();
 
 	*pos = 0;
 	appendPQExpBuffer(buf, "ALTER %s %s ", type, fmtId(name));