More WARN_CREATE_GLOBAL cleanups.
More WARN_CREATE_GLOBAL cleanups.

Followup to 908c4fe150c4023662462c96f634f6f710000cef.
Found by test-perfs.zsh.

danielshahaf/zsh-syntax-highlighting-debian,x-way/zsh-syntax-highlighting,psprint/zsh-syntax-highlighting,psprint/zsh-syntax-highlighting,P71/zsh-syntax-highlighting,x-way/zsh-syntax-highlighting,zsh-users/zsh-syntax-highlighting,joshuarubin/dotfiles,m0vie/zsh-syntax-highlighting,P71/zsh-syntax-highlighting,danielshahaf/zsh-syntax-highlighting-debian,phy1729/zsh-syntax-highlighting,joshuarubin/dotfiles,stuha/wbr-zsh,joshuarubin/dotfiles,danielshahaf/zsh-syntax-highlighting,zsh-users/zsh-syntax-highlighting,m0vie/zsh-syntax-highlighting,phy1729/zsh-syntax-highlighting,danielshahaf/zsh-syntax-highlighting,joshuarubin/dotfiles