Sub-domain to root redirect–A small problem

I have moved my blog from sub-domain to root
previously it was
http://gagankalra.totalbarmy.org
and now it is

http://totalbarmy.org

I have changed my .htaccess file and append the following code at the top

# SubDomains
RewriteCond %{HTTP_HOST} ^gagankalra.totalbarmy.org  [OR]
RewriteCond %{HTTP_HOST} ^www.gagankalra.totalbarmy.org
RewriteRule ^(.*)$ http://totalbarmy.org/$1 [R=301,L]

Following redirects work with this
http://gagankalra.totalbarmy.org/post_title to http://totalbarmy.org/post_title

But the problem comes at the home page

i.e.

http://gagankalra.totalbarmy.org is getting transferred to
http://totalbarmy.org/gagankalra
which of course doesn’t exist.
The desired result is http://totalbarmy.org

Please any suggestions, urgently required..Thanks