initscripts: let status return 0 when proc is running well

initscripts: let status return 0 when proc is running well

Ensure that the status returns 0 instead of the last shell command result,
otherwise the calling script can not properly detect the status of pid.

(From OE-Core rev: d9d4fdc769dfe6bf9838f5c5f3189a80f0e3cf90)

Signed-off-by: Jesse Zhang <sen.zhang@windriver.com>
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Mark Hatle <mark.hatle@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>