Set encoding to NULL when starting.

Submitted by: eirikald

psqldbadm/psql-dbadm.c

@@ -65,7 +65,7 @@ main(int argc, char **argv)
 	int action = 0, c;
 	char *dbname = NULL, *owner = NULL;
 	char _dbname[1024], _owner[1024];
-	char *encoding, _encoding[1024];
+	char *encoding = NULL, _encoding[1024];
 
 	while ((c = getopt(argc, argv, "hadlu:o:E:")) != -1) {
 		switch (c) {