[PATCH 5/7] selftests: ftrace: Fix trigger extended error testcase

From: Masami Hiramatsu Previous testcase redirects echo-out into /dev/null using "&>" as below echo "trigger-command" >> trigger &> /dev/null But this means redirecting both stdout and stderr into /dev/null because it is same as below echo "trigger-command" >> trigger >

[PATCH 5/7] selftests: ftrace: Fix trigger extended error testcase

From: Masami Hiramatsu Previous testcase redirects echo-out into /dev/null using "&>" as below echo "trigger-command" >> trigger &> /dev/null But this means redirecting both stdout and stderr into /dev/null because it is same as below echo "trigger-command" >> trigger > /dev/null 2>&1 So ">>