patch 8.2.4318: various comment and indent mistakes, returning wrong zero

Problem:    Various comment and indent mistakes, returning wrong zero.
Solution:   Fix the mistakes.  Return NULL instead of FAIL.
diff --git a/src/clientserver.c b/src/clientserver.c
index 793570a..caa6fdc 100644
--- a/src/clientserver.c
+++ b/src/clientserver.c
@@ -651,7 +651,7 @@
     ga_concat(&ga, (char_u *)":");
     if (inicmd != NULL)
     {
-	// Can't use <CR> after "inicmd", because an "startinsert" would cause
+	// Can't use <CR> after "inicmd", because a "startinsert" would cause
 	// the following commands to be inserted as text.  Use a "|",
 	// hopefully "inicmd" does allow this...
 	ga_concat(&ga, inicmd);