prism54: call BUG_ON() earlier

This test is off by one because strlen() doesn't include the NULL
terminator.
Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/prism54/isl_ioctl.c

@@ -2067,7 +2067,7 @@ send_simple_event(islpci_private *priv, const char *str)
 	memptr = kmalloc(IW_CUSTOM_MAX, GFP_KERNEL);
 	if (!memptr)
 		return;
-	BUG_ON(n > IW_CUSTOM_MAX);
+	BUG_ON(n >= IW_CUSTOM_MAX);
 	wrqu.data.pointer = memptr;
 	wrqu.data.length = n;
 	strcpy(memptr, str);