zsh: treewide: minor fixes/style

.config/zsh/alias/grep.zsh

@@ -2,9 +2,11 @@
 
 z-alt-grep() {
     local -a a
+    local n
+
     a=( ${(@s:|:)1} )
     [ ${#a} = 0 ] && a=( "$1" )
-    local n=${#a}
+    n=${#a}
     [ -z "$1" ] && n=0
     case "$n" in
     0) ;;