conf.c: Slight update in TTY fallback behavior.

If no tty is configured in finit.conf, only use FALLBACK_SHELL (usually
/bin/sh on UNIX) when no console is configured either.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

finit.h

@@ -54,6 +54,8 @@
 # define HAVE_DBUS
 #endif
 
+/* If the user configures us to not know about any getty use the system
+ * defined /bin/sh (or similar) as fallback for TTYs. */
 #ifndef FALLBACK_SHELL
 # define FALLBACK_SHELL		_PATH_BSHELL
 #endif