Bugfix: Do not free() static string in new runparts directive

This is a bugfix to 785c21d, which introduced the new runparts
directive in finit.conf

- Do not attempt to free() a static string, use same approach as
  username and hostname.

- Do not overwrite hostname, set the correct variable if runparts
  directive is found in finit.conf

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

finit.c

@@ -41,7 +41,7 @@ char *sdown    = NULL;
 char *network  = NULL;
 char *username = NULL;
 char *hostname = NULL;
-char *rcsd     = FINIT_RCSD;
+char *rcsd     = NULL;
 
 
 static void parse_kernel_cmdline(void)