Staging: comedi: cb_pcimdda.c: Checkpatch cleanup

WARNING: braces {} are not necessary for any arm of this statement
+	if (it->options[2]) {
[...]
+	} else {
[...]

WARNING: braces {} are not necessary for single statement blocks
+			if (devpriv->registers) {
+				comedi_pci_disable(devpriv->pci_dev);
+			}

Signed-off-by: Andrea Gelmini <andrea.gelmini@gelma.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>