Unchecked return value

If the function returns an error value, the error value may be mistaken for a normal value. Value returned from a function is not checked for errors before being used
/src/mongo/db/modules/enterprise/src/fcbis/initial_sync_file_mover.cpp:144: CHECKED_RETURN 120737 Calling "fsync" without checking return value (as is done elsewhere 6 out of 8 times).