storage/posix:  lgetxattr called with invalid keys on the bricks

More invalid keys have crept in since this was fixed. We need a better
strategy for avoiding this than the current noticed-in-an-strace...

Cleaned tabs while I'm at it.

Change-Id: I00bd10471c4e4caf32b8a5b38660268324aa7a10
BUG: 765202
Signed-off-by: Kaleb S. KEITHLEY <kkeithle@redhat.com>
Reviewed-on: http://review.gluster.org/7005
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
Reviewed-by: Jeff Darcy <jdarcy@redhat.com>