completion: bash: synchronize zsh wrapper

A function was missing.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/completion/git-completion.bash

@@ -3510,6 +3510,14 @@ if [[ -n ${ZSH_VERSION-} ]] &&
 		compadd -Q -S "${4- }" -p "${2-}" -- ${=1} && _ret=0
 	}
 
+	__gitcomp_nl_append ()
+	{
+		emulate -L zsh
+
+		local IFS=$'\n'
+		compadd -Q -S "${4- }" -p "${2-}" -- ${=1} && _ret=0
+	}
+
 	__gitcomp_file_direct ()
 	{
 		emulate -L zsh