booster: Must check errno for error number not return value
booster: Must check errno for error number not return value

Signed-off-by: Shehjar Tikoo <shehjart@gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 346 (booster returns success on failed getxattr and lgetxattr)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=346

Kaushikbv/Gluster,Kaushikbv/Gluster,Kaushikbv/Gluster