SQUASHME: remove needless stdin closure

We already redirect the varnishtest worker processes stdin to /dev/null.

Author: dridi

bin/varnishtest/tests/r04323.vtc

@@ -6,6 +6,5 @@ varnish v1 -clierr 107 "param.set vcc_feature all"
 varnish v1 -clierr 107 "param.set vcc_allow_inline_c on"
 
 shell -err -expect "Cannot mark alias vcc_allow_inline_c read only" {
-	exec <&-
 	varnishd -d -r vcc_allow_inline_c -n ${tmpdir}/vd
 }