package/*: remove useless explicit set of function returncode

somebody started to set a function returncode in the validation
stuff and everybody copies it, e.g.

myfunction()
{
	fire_command

	return $?
}

a function automatically returns with the last returncode,
so we can safely remove the command 'return $?'. reference:

http://tldp.org/LDP/abs/html/exit-status.html
"The last command executed in the function or script determines the exit status."

Signed-off-by: Bastian Bittorf <bittorf@bluebottle.com>

SVN-Revision: 42278

package/utils/busybox/files/sysntpd

@@ -9,7 +9,6 @@ PROG=/usr/sbin/ntpd
 validate_ntp_section() {
 	uci_validate_section system timeserver "${1}" \
 		'server:list(host)' 'enabled:bool:1' 'enable_server:bool:0'
-	return $?
 }
 
 start_service() {