linux-imx

kbuild: remove redundant 'set -e' from cmd_* defines

These three cmd_* are invoked in the $(call cmd,*) form.

Now that 'set -e' moved to the 'cmd' macro, they do not need to
explicitly give 'set -e'.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>