* src/shred.c: (VERBOSE_UPDATE): Update every 5 seconds, not every 10.

* src/shred.c: (VERBOSE_UPDATE): Update every 5 seconds, not every 10.
(wipename): Quote file names only when necessary.
(main): Copy quoted string into malloc'd storage so it doesn't
get clobbered when using -u and --verbose.

Minor clean-up.
* src/shred.c:
Use `NULL' rather than `(time_t *) 0'.
(dopass): Use STREQ in place of strcmp.
Add parentheses around use of nested ternary operator.