df(1) - use return, not exit() in main()

[Michal Mazurek]

Replace exit() with return.

Index: df.c
===================================================================
RCS file: /cvs/src/bin/df/df.c,v
retrieving revision 1.54
diff -u -p -r1.54 df.c
--- df.c        9 Oct 2015 01:37:06 -0000       1.54
+++ df.c        1 Feb 2016 17:58:59 -0000
@@ -178,7 +178,7 @@ main(int argc, char *argv[])
                        bsdprint(mntbuf, mntsize, maxwidth);
        }
 
-       exit(mntsize ? 0 : 1);
+       return mntsize ? 0 : 1;
 }
 
 char *


But perhaps the logic is incorrect:
        $ df -t nfs
        $ echo $?
        1
Is an empty list an error? GNU df returns 1 with an error message "df:
no file systems processed". NetBSD returns 0, but only because it
doesn't have this commit.

Commit 1.39 "Don't print header if we didn't print any usage lines."
contained the change:

-       exit(0);
+       exit(mntsize ? 0 : 1);

-- 
Michal Mazurek