main/mariadb: quote variables

Partial fix. Subsequent scripts like 'mysqld_safe' still do not handle whitespaces in filenames properly.

main/mariadb/mariadb.initd

@@ -12,9 +12,9 @@ depend() {
 }
 
 start_pre() {
-	required_dirs=$(getconf datadir "/var/lib/mysql")
+	required_dirs="$(getconf datadir '/var/lib/mysql')"
 
-	if [ ! -d $required_dirs/mysql ]; then
+	if [ ! -d "$required_dirs/mysql" ]; then
 		eerror "Datadir '$required_dirs' is empty or invalid."
 		eerror "Run '/etc/init.d/mariadb setup' to create new database."
 	fi
@@ -26,11 +26,11 @@ start_post() {
 
 setup() {
 	ebegin "Creating a new MySQL database"
-	mysql_install_db --user=mysql --datadir=$(getconf datadir "/var/lib/mysql")
+	mysql_install_db --user=mysql --datadir="$(getconf datadir '/var/lib/mysql')"
 	eend $?
 }
 
 getconf() {
 	v=$(my_print_defaults --mysqld | grep ^--$1)
-	[ -z $v ] && echo $2 || echo ${v#*=}
+	[ -z "$v" ] && echo "$2" || echo "${v#*=}"
 }