Do only set LOG_PATH if LOG_PATH is not set

pg_db_dump_file.sh

@@ -243,17 +243,23 @@ if [ "${REDHAT}" -eq 1 ]; then
 	# This is also for Amazon NEWER (after 9.6)
 	PG_BASE_PATH="/usr/pgsql-";
 	# I assume that as default
+	if [ -z "${LOG_PATH}" ]; then
 		LOG_PATH="/var/lib/pgsql/${DB_VERSION}/data/log/";
+	fi;
 elif [ "${AMAZON}" -eq 1 ]; then
 	# only older 9.6 or before
 	PG_BASE_PATH="/usr/lib64/pgsql";
 	# LOG PATH, will be attached to DB VERSION
+	if [ -z "${LOG_PATH}" ]; then
 		LOG_PATH="/var/lib/pgsql${DB_VERSION}/data/pg_log";
+	fi;
 else
 	# Debian base path
 	PG_BASE_PATH="/usr/lib/postgresql/";
+	if [ -z "${LOG_PATH}" ]; then
 		LOG_PATH="/var/log/postgresql/";
 	fi;
+fi;
 
 # setup log before everything else
 LOG="${LOG_PATH}pg_db_dump_file.log";