perf tests: Fix *probe_vfs_getname.sh test failures

perf tests: Fix *probe_vfs_getname.sh test failures

The commit 4d6101f5fd5d9960 ("perf probe: Clarify error message about
not finding kernel modules debuginfo") changed the error message "Failed
to find the path for kernel" to "Failed to find the path for the
kernel".

Update the regex so that the tests still skip rather than fail when
kernel debug symbols aren't present.

Signed-off-by: James Clark <james.clark@arm.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Link: http://lore.kernel.org/lkml/20210825164259.833222-1-james.clark@arm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>