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/base-files/files/etc/init.d/system

@@ -12,8 +12,6 @@ validate_system_section()
 		'buffersize:uinteger' \
 		'timezone:string:UTC' \
 		'zonename:string'
-
-	return $?
 }
 
 system_config() {