completion: zsh: simplify compadd functions

We don't need to override IFS, zsh has a native way of splitting by new
lines: the expansion flag (f).

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

contrib/completion/git-completion.zsh

@@ -100,9 +100,8 @@ __gitcomp_direct ()
 {
 	emulate -L zsh
 
-	local IFS=$'\n'
 	compset -P '*[=:]'
-	compadd -Q -- ${${=1}% } && _ret=0
+	compadd -Q -- ${${(f)1}% } && _ret=0
 }
 
 __gitcomp_direct_append ()
@@ -114,34 +113,30 @@ __gitcomp_nl ()
 {
 	emulate -L zsh
 
-	local IFS=$'\n'
 	compset -P '*[=:]'
-	compadd -Q -S "${4- }" -p "${2-}" -- ${=1} && _ret=0
+	compadd -Q -S "${4- }" -p "${2-}" -- ${(f)1} && _ret=0
 }
 
 __gitcomp_nl_append ()
 {
 	emulate -L zsh
 
-	local IFS=$'\n'
 	compset -P '*[=:]'
-	compadd -Q -S "${4- }" -p "${2-}" -- ${=1} && _ret=0
+	compadd -Q -S "${4- }" -p "${2-}" -- ${(f)1} && _ret=0
 }
 
 __gitcomp_file_direct ()
 {
 	emulate -L zsh
 
-	local IFS=$'\n'
-	compadd -f -- ${=1} && _ret=0
+	compadd -f -- ${(f)1} && _ret=0
 }
 
 __gitcomp_file ()
 {
 	emulate -L zsh
 
-	local IFS=$'\n'
-	compadd -p "${2-}" -f -- ${=1} && _ret=0
+	compadd -p "${2-}" -f -- ${(f)1} && _ret=0
 }
 
 __git_zsh_bash_func ()