patch 8.2.4928: various white space and cosmetic mistakes

Problem:    Various white space and cosmetic mistakes.
Solution:   Change spaces to tabs, improve comments.
diff --git a/src/filepath.c b/src/filepath.c
index 09c9f4a..56a99e4 100644
--- a/src/filepath.c
+++ b/src/filepath.c
@@ -1648,7 +1648,7 @@
     char_u	*p;
     garray_T	ga;
     int		i;
-    int         sort = READDIR_SORT_BYTE;
+    int		sort = READDIR_SORT_BYTE;
 
     if (rettv_list_alloc(rettv) == FAIL)
 	return;
@@ -1701,7 +1701,7 @@
     char_u	*path;
     garray_T	ga;
     int		i;
-    int         sort = READDIR_SORT_BYTE;
+    int		sort = READDIR_SORT_BYTE;
 
     if (rettv_list_alloc(rettv) == FAIL)
 	return;