[PATCH] Char: mxser_new, debug printk dependent on DEBUG

Print some debug info only when DEBUG is enabled (use pr_debug macro).
Eliminate verbose kernel parameter which takes care of this.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>