add an init function parameter to qemu_chr_open()

And use it for the malta emulation. Fix segfault introduced in
revision 6352.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6365 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/console.c b/console.c
index b452bca..6f0f1af 100644
--- a/console.c
+++ b/console.c
@@ -1357,6 +1357,8 @@
     text_console_resize(s);
 
     qemu_chr_reset(chr);
+    if (chr->init)
+        chr->init(chr);
 }
 
 CharDriverState *text_console_init(const char *p)