It rarely observes the problem while running shell script aborting
test repeatedly, at the problem, the test shell script never returns
to shell
Steps to reproduce:
1. Run test script and ctrl-c repeatedly
2. Observe whether returns to shell after ctrl-c
(From OE-Core rev: 1b69769b52c888d74c0ba258b7450e05a6c82a5a)
Signed-off-by: Xiangyu Chen <xiangyu.chen@windriver.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>