[libgpiod][PATCH] tools: tests: replace egrep with grep -E

[Bartosz Golaszewski <brgl@bgdev.pl>]

From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Since version 3.11 egrep emits the following warning to stderr on startup:

  egrep: warning: egrep is obsolescent; using grep -E

This makes the tests fail (though that seems to depend on BATS version)
so replace egrep with grep -E as suggested.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
---
 tools/gpio-tools-test      | 2 +-
 tools/gpio-tools-test.bats | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/gpio-tools-test b/tools/gpio-tools-test
index 5b6c72e..ed39ed5 100755
--- a/tools/gpio-tools-test
+++ b/tools/gpio-tools-test
@@ -37,7 +37,7 @@ check_prog() {
 check_prog bats
 check_prog modprobe
 check_prog timeout
-check_prog egrep
+check_prog grep
 
 # Check if we're running a kernel at the required version or later
 check_kernel $MIN_KERNEL_VERSION
diff --git a/tools/gpio-tools-test.bats b/tools/gpio-tools-test.bats
index adbce94..c83ca7d 100755
--- a/tools/gpio-tools-test.bats
+++ b/tools/gpio-tools-test.bats
@@ -154,7 +154,7 @@ gpiosim_cleanup() {
 		ls $BANKPATH/line* > /dev/null 2>&1
 		if [ "$?" = "0" ]
 		then
-			for LINE in $(find $BANKPATH/ | egrep "line[0-9]+$")
+			for LINE in $(find $BANKPATH/ | grep -E "line[0-9]+$")
 			do
 				test -e $LINE/hog && rmdir $LINE/hog
 				rmdir $LINE
-- 
2.39.2