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/os_unix.c b/src/os_unix.c
index 76e7a8a..e77a4b2 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -7501,9 +7501,9 @@
     {
 	Gpm_Close(); // We don't want to talk to xterm via gpm
 
-        // Gpm_Close fails to properly restore the WINCH and TSTP handlers,
-        // leading to Vim ignoring resize signals. We have to re-initialize
-        // these handlers again here.
+	// Gpm_Close fails to properly restore the WINCH and TSTP handlers,
+	// leading to Vim ignoring resize signals. We have to re-initialize
+	// these handlers again here.
 # ifdef SIGWINCH
 	mch_signal(SIGWINCH, sig_winch);
 # endif