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/indent.c b/src/indent.c
index 777db24..0d6fadb 100644
--- a/src/indent.c
+++ b/src/indent.c
@@ -996,7 +996,7 @@
 # else
 	if (wp->w_briopt_vcol == 0)
 	    prev_indent = get_indent_str(line,
-				        (int)wp->w_buffer->b_p_ts, no_ts);
+					(int)wp->w_buffer->b_p_ts, no_ts);
 # endif
 	prev_tick = CHANGEDTICK(wp->w_buffer);
 	prev_listopt = wp->w_briopt_list;