block/013: Fix check for blockdev output

In some systems the operator "<<<" may not behave as expected. Replace
this operator by a more canonical approach to grep content from a
variable.

Signed-off-by: André Almeida <andrealmeid@collabora.com>

diff --git a/tests/block/013 b/tests/block/013
index ed0885c8c829a216dc1d66ace7be8b1906fb442b..84e2ebbf456171bd62bbe5a8c7275f9f9335be3b 100755 (executable)
--- a/tests/block/013
+++ b/tests/block/013
@@ -27,7 +27,7 @@ test_device() {
 
        local out
        out="$(blockdev --rereadpt "$TEST_DEV" 2>&1)"
-       if ! grep -o "Device or resource busy" <<< "$out"; then
+       if ! echo "$out" | grep -o "Device or resource busy"; then
                echo "$out"
        fi