(jm_FILE_SYSTEM_USAGE): Add `[]' between use of
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-rw-r--r-- 11651 ABOUT-NLS
-rw-r--r-- 17992 COPYING
-rw-r--r-- 1003 GNUmakefile
-rw-r--r-- 7831 INSTALL
-rw-r--r-- 5678 Makefile.maint
-rw-r--r-- 17092 THANKS
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drwxr-xr-x - m4
drwxr-xr-x - man
drwxr-xr-x - old
drwxr-xr-x - po
drwxr-xr-x - src
drwxr-xr-x - tests