dm: test: Correct a stray backslash in dm_test_destroy()

This should perhaps be a period.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
[bmeng: add the ending period and reword the commit message]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
1 file changed