nslookup: shrink send_queries()

nslookup: shrink send_queries()

function                                             old     new   delta
rcodes                                                68      64      -4
nslookup_main                                       2007    1880    -127
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-131)           Total: -131 bytes
   text	   data	    bss	    dec	    hex	filename
 926735	    555	   5740	 933030	  e3ca6	busybox_old
 926525	    555	   5740	 932820	  e3bd4	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>