tracing: Remove size restriction on hist trigger cmd error logging

Currently, hist trigger command error strings are restricted to a
length of MAX_FILTER_STR_VAL (256), which is too short for some
commands already seen in the wild (with cmd strings longer than that
showing up truncated in err_log).

Remove the restriction so that no hist trigger command error string is
ever truncated.

Signed-off-by: Tom Zanussi <zanussi@kernel.org>
1 file changed