top: Modified integer bounds check for count/bs
top: Modified integer bounds check for count/bs

Signed-off-by: Krishnan Parthasarathi <kp@gluster.com>
Signed-off-by: Anand Avati <avati@gluster.com>

BUG: 2721 (Incorrect validation message in gluster top CLI)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=2721

Kaushikbv/Gluster,Kaushikbv/Gluster,Kaushikbv/Gluster