kgdboc,kgdbts: strlen() doesn't count the terminator

This is an off by one because strlen() doesn't count the null
terminator.  We strcpy() these strings into an array of size
MAX_CONFIG_LEN.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
diff --git a/drivers/tty/serial/kgdboc.c b/drivers/tty/serial/kgdboc.c
index 25a8bc5..87e7e6c 100644
--- a/drivers/tty/serial/kgdboc.c
+++ b/drivers/tty/serial/kgdboc.c
@@ -131,7 +131,7 @@
 
 static int kgdboc_option_setup(char *opt)
 {
-	if (strlen(opt) > MAX_CONFIG_LEN) {
+	if (strlen(opt) >= MAX_CONFIG_LEN) {
 		printk(KERN_ERR "kgdboc: config string too long\n");
 		return -ENOSPC;
 	}