hash_string: Fix zero-length case for !DCACHE_WORD_ACCESS

The self-test was updated to cover zero-length strings; the function
needs to be updated, too.

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: George Spelvin <linux@sciencehorizons.net>
Fixes: fcfd2fbf22d2 ("fs/namei.c: Add hashlen_string() function")
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

path: root/tools/perf/scripts/perl/bin/rw-by-file-report

#!/bin/bash
# description: r/w activity for a program, by file
# args: <comm>
if [ $# -lt 1 ] ; then
    echo "usage: rw-by-file <comm>"
    exit
fi
comm=$1
shift
perf script $@ -s "$PERF_EXEC_PATH"/scripts/perl/rw-by-file.pl $comm