g: fix duplicate files with directory argument

When we encounter a directory in the argument list, we don't want to
walk every argument, just that directory.

rc/bin/g

@@ -29,7 +29,7 @@ case *
 	shift
 	for(f in $*){
 		if(test -d $f)
-			files=($files `$nl{walk -f $recurse -- $* \
+			files=($files `$nl{walk -f $recurse -- $f \
 				| grep -e $fullnames -e $suffixes >[2]/dev/null})
 		if not
 			files=($files $f)