Fix error message print on undefined macro expansion in varnishtest. It would print to end of line instead of parsed macro name length.
Fix error message print on undefined macro expansion in
varnishtest. It would print to end of line instead of parsed macro
name length.

feld/Varnish-Cache,chrismoulton/Varnish-Cache,zhoualbeart/Varnish-Cache,zhoualbeart/Varnish-Cache,gquintard/Varnish-Cache,ajasty-cavium/Varnish-Cache,gquintard/Varnish-Cache,franciscovg/Varnish-Cache,franciscovg/Varnish-Cache,feld/Varnish-Cache,franciscovg/Varnish-Cache,ajasty-cavium/Varnish-Cache,mrhmouse/Varnish-Cache,gauthier-delacroix/Varnish-Cache,zhoualbeart/Varnish-Cache,varnish/Varnish-Cache,gauthier-delacroix/Varnish-Cache,varnish/Varnish-Cache,alarky/varnish-cache-doc-ja,mrhmouse/Varnish-Cache,varnish/Varnish-Cache,ajasty-cavium/Varnish-Cache,gauthier-delacroix/Varnish-Cache,feld/Varnish-Cache,mrhmouse/Varnish-Cache,zhoualbeart/Varnish-Cache,gauthier-delacroix/Varnish-Cache,mrhmouse/Varnish-Cache,alarky/varnish-cache-doc-ja,ajasty-cavium/Varnish-Cache,chrismoulton/Varnish-Cache,alarky/varnish-cache-doc-ja,chrismoulton/Varnish-Cache,feld/Varnish-Cache,feld/Varnish-Cache,ajasty-cavium/Varnish-Cache,varnish/Varnish-Cache,alarky/varnish-cache-doc-ja,gauthier-delacroix/Varnish-Cache,varnish/Varnish-Cache,franciscovg/Varnish-Cache,chrismoulton/Varnish-Cache,zhoualbeart/Varnish-Cache,gquintard/Varnish-Cache,chrismoulton/Varnish-Cache,gquintard/Varnish-Cache,franciscovg/Varnish-Cache,alarky/varnish-cache-doc-ja,mrhmouse/Varnish-Cache