ktest: cleanup get_grub_index

[ Upstream commit 38891392916c42d4ba46f474d553c76d1ed329ca ]

Cleanup get_grub_index().

Link: http://lkml.kernel.org/r/20190509213647.6276-3-msys.mizuma@gmail.com



Signed-off-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Stable-dep-of: 26df05a8c142 ("kest.pl: Fix grub2 menu handling for rebooting")
Signed-off-by: Sasha Levin <sashal@kernel.org>