patch 9.1.0581: Various lines are indented inconsistently

Problem:  style: Various lines are indented inconsistently
Solution: Retab these lines and correct some comments.
          (zeertzjq)

closes: #15259

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/fileio.c b/src/fileio.c
index e7f3332..7bae626 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -3936,7 +3936,7 @@
     ret = mch_lstat((char *)from, &st);
     if (ret >= 0 && S_ISLNK(st.st_mode))
     {
-        ret = FAIL;
+	ret = FAIL;
 
 	len = readlink((char *)from, linkbuf, MAXPATHL);
 	if (len > 0)