Fix for bug #4781: allow cleaning of /etc/mtab by canonicalizing mountpoint.

Canonicalize mountpoint by trimming trailing slashes before unmounting.
This allows for correct cleanup of /etc/mtab after unmounting.

Thanks to Steve Langasek <vorlon@debian.org>.

Michael

source/client/umount.cifs.c

@@ -341,6 +341,13 @@ int main(int argc, char ** argv)
 
 	/* fixup path if needed */
 
+	/* Trim any trailing slashes */
+	while ((strlen(mountpoint) > 1) &&
+		(mountpoint[strlen(mountpoint)-1] == '/'))
+	{
+		mountpoint[strlen(mountpoint)-1] = '\0';
+	}
+
 	/* make sure that this is a cifs filesystem */
 	rc = statfs(mountpoint, &statbuf);