PMFS: Remove unnecessary flushing from pmfs_fsync()

Fixing a bug in pmfs_fsync() where we were clflushing the specified
range even if the file was not mmaped. Now we do clflushes only for the
files that are mmaped.  Also fixed some indentation in bbuild.c

Signed-off-by: Sanjay Kumar <sanjay.k.kumar@intel.com>