tools: tests: remove dependency on grep

We only use grep in one place where we don't really need it as we can use
find directly.

Reported-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Suggested-by: Kent Gibson <warthog618@gmail.com>
Reviewed-by: Kent Gibson <warthog618@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20240528-fix-bash-tests-v3-4-e9b5be2ba8bf@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

tools/gpio-tools-test.bash

@@ -158,19 +158,10 @@ gpiosim_cleanup() {
  local BANKPATH=$DEVPATH/bank0
 
  echo 0 > $DEVPATH/live
-
- ls $BANKPATH/line* > /dev/null 2>&1
- if [ "$?" = "0" ]
- then
- for LINE in $(find $BANKPATH/ | grep -E "line[0-9]+$")
- do
- test -e $LINE/hog && rmdir $LINE/hog
- rmdir $LINE
- done
- fi
-
- rmdir $BANKPATH
- rmdir $DEVPATH
+ find "$DEVPATH" -type d -name hog -exec rmdir '{}' '+'
+ find "$DEVPATH" -type d -name "line*" -exec rmdir '{}' '+'
+ find "$DEVPATH" -type d -name "bank*" -exec rmdir '{}' '+'
+ rmdir "$DEVPATH"
  done
 
  gpiosim_chip_symlink_cleanup
@@ -3078,7 +3069,6 @@ check_prog() {
 check_prog shunit2
 check_prog modprobe
 check_prog timeout
-check_prog grep
 
 # Check if we're running a kernel at the required version or later
 check_kernel $MIN_KERNEL_VERSION