feedAppendOnlyFile return ASAP

[Bannirui]

Locating at:

redis/src/aof.c

Line 1340 in e92363e

if (server.aof_state == AOF_ON ||

I think it could be put at the entrance of this function, so it could be fail ASAP if AOF_OFF.

It maybe looks like as:

void feedAppendOnlyFile(int dictid, robj ** argv, int argc) {
    if (server.aof_state != AOF_ON &&
        (server.aof_state != AOF_WAIT_REWRITE || server.child_type != CHILD_TYPE_AOF))
    {
        return;
    }
    // todo
}