df on an unlisted mount point

[Eirik Fuller]

In recent versions of fileutils (the enclosed patch is against 4.0x)
the code in df which handles mount points which are not listed is
never reached if /etc/mtab lists the root directory's mount point.

With this patch, df reaches that code.

--- src/df.c-   Mon Jun 26 14:51:19 2000
+++ src/df.c    Sat Aug  5 23:58:39 2000
@@ -611,7 +611,9 @@
            }
       }
 
-    if (best_match && !STREQ (best_match->me_type, "lofs"))
+    if (best_match && !STREQ (best_match->me_type, "lofs")
+       && stat (best_match->me_mountdir, &disk_stats) == 0
+       && disk_stats.st_dev == statp->st_dev)
       {
        me = best_match;
        goto show_me;