config.c: fix current_config uninit warning (#2249)
config.c: fix current_config uninit warning (#2249)

1ace/sway,taiyu-len/sway,ascent12/sway,ascent12/sway,taiyu-len/sway,1ace/sway,ascent12/sway,SirCmpwn/sway,taiyu-len/sway,1ace/sway