hw/fsp: Remove stray va_end() in __fsp_fillmsg()

__fsp_fillmsg() is called from fsp_fillmsg() and fsp_mkmsg(). Both
callers wrap it in a va_start() / va_end() pair so using va_end()
inside the function is almost certainly wrong.

Signed-off-by: Oliver O'Halloran <oohall@gmail.com>

hw/fsp/fsp.c

@@ -995,7 +995,6 @@ static void __fsp_fillmsg(struct fsp_msg *msg, u32 cmd_sub_mod,
 
 	for (i = 0; i < add_words; i++)
 		fsp_msg_set_data_word(msg, i, va_arg(list, unsigned int));
-	va_end(list);
 }
 
 void fsp_fillmsg(struct fsp_msg *msg, u32 cmd_sub_mod, u32 add_words, ...)