Simplify argument handling

misc/quitcd/quitcd.bash

@@ -2,11 +2,7 @@ export NNN_TMPFILE="/tmp/nnn"
 
 n()
 {
-        if [ -n "$1" ]; then
-                nnn "$1"
-        else
-                nnn
-        fi
+        nnn "$@"
 
         if [ -f $NNN_TMPFILE ]; then
                 . $NNN_TMPFILE

misc/quitcd/quitcd.fish

@@ -1,7 +1,7 @@
 export NNN_TMPFILE="/tmp/nnn"
 
 function n --description 'support nnn quit and change directory'
-        nnn $argv[1]
+        nnn $argv
 
         if test -e $NNN_TMPFILE
                 . $NNN_TMPFILE

misc/quitcd/quitcd.zsh

@@ -2,11 +2,7 @@ export NNN_TMPFILE="/tmp/nnn"
 
 n()
 {
-        if [ -n "$1" ]; then
-                nnn "$1"
-        else
-                nnn
-        fi
+        nnn "$@"
 
         if [ -f $NNN_TMPFILE ]; then
                 . $NNN_TMPFILE