bc: drop zbc_parse_endBody() bool parameter, move its code to caller which uses it

bc: drop zbc_parse_endBody() bool parameter, move its code to caller which uses it

function                                             old     new   delta
zbc_parse_stmt                                      1456    1479     +23
zbc_parse_body                                       103     101      -2
zbc_parse_endBody                                    326     292     -34
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/2 up/down: 23/-36)            Total: -13 bytes
   text	   data	    bss	    dec	    hex	filename
 979893	    485	   7296	 987674	  f121a	busybox_old
 979880	    485	   7296	 987661	  f120d	busybox_unstripped

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