runsv: code shrink: use single handler function for SIGTERM and SIGCHLD

function                                             old     new   delta
s_chld_term                                            -      36     +36
runsv_main                                          1677    1662     -15
s_child                                               22       -     -22
s_term                                                29       -     -29
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(add/remove: 1/2 grow/shrink: 0/1 up/down: 36/-66)            Total: -30 bytes

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