perf tests stat+csv_output: Fix shellcheck warnings

Running the shellcheck on stat+csv_output resulted in the following
warning.

Result with shellcheck  without patch:
=====
$ shellcheck -S warning stat+csv_output.sh

In stat+csv_output.sh line 23:
         [ $(uname -m) = "s390x" ] && exp='^[6-7]$'
           ^---------^ SC2046: Quote this to prevent word splitting.
In stat+csv_output.sh line 51:
[ $(id -u) != 0 ] && [ $(cat /proc/sys/kernel/perf_event_paranoid) -gt $1 ]
  ^------^ SC2046: Quote this to prevent word splitting.
                       ^-- SC2046: Quote this to prevent word splitting.
=====

Fixed the warning SC2046 by adding quotes to prevent word splitting.

Result with shellcheck with patch:
=====
$ shellcheck -S warning tests/shell/stat+csv_output.sh
$ ./perf test "stat CSV output linter"
 96: perf stat CSV output linter                                     : Ok
=====

Signed-off-by: Korrapati Likhitha <[email protected]>
Cc: Disha Goel <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: John Garry <[email protected]>
Cc: Madhavan Srinivasan <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Ravi Bangoria <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Athira Rajeev <[email protected]>
Signed-off-by: Kajol Jain <[email protected]>
Signed-off-by: Sathvika Vasireddy <[email protected]>
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

0 files changed, 0 insertions, 0 deletions