pre-commit hook: fix whitespace error detection
pre-commit hook: fix whitespace error detection

--quiet implies --exit-code

letouzey/coq-wip,gares/coq,maximedenes/coq,silene/coq,ejgallego/coq,ppedrot/coq,SkySkimmer/coq,maximedenes/coq,coq/coq,SkySkimmer/coq,JasonGross/coq,coq/coq,JasonGross/coq,letouzey/coq-wip,ejgallego/coq,gares/coq,JasonGross/coq,SkySkimmer/coq,Zimmi48/coq,ejgallego/coq,coq/coq,Matafou/coq,maximedenes/coq,maximedenes/coq,ppedrot/coq,Zimmi48/coq,Zimmi48/coq,letouzey/coq-wip,SkySkimmer/coq,ppedrot/coq,gares/coq,coq/coq,Zimmi48/coq,ppedrot/coq,letouzey/coq-wip,Matafou/coq,gares/coq,silene/coq,JasonGross/coq,gares/coq,ejgallego/coq,ppedrot/coq,maximedenes/coq,Matafou/coq,silene/coq,letouzey/coq-wip