pySim-*.py: refactor card reader driver initialization

This would facilitate adding new card reader drivers.

Change-Id: Ia893537786c95a6aab3a51fb1ba7169023d5ef97
diff --git a/pySim-read.py b/pySim-read.py
index e807e3e..066b0df 100755
--- a/pySim-read.py
+++ b/pySim-read.py
@@ -70,13 +70,13 @@
 	# Parse options
 	opts = parse_options()
 
-	# Connect to the card
-	if opts.pcsc_dev is None:
-		from pySim.transport.serial import SerialSimLink
-		sl = SerialSimLink(device=opts.device, baudrate=opts.baudrate)
-	else:
+	# Init card reader driver
+	if opts.pcsc_dev is not None:
 		from pySim.transport.pcsc import PcscSimLink
 		sl = PcscSimLink(opts.pcsc_dev)
+	else: # Serial reader is default
+		from pySim.transport.serial import SerialSimLink
+		sl = SerialSimLink(device=opts.device, baudrate=opts.baudrate)
 
 	# Create command layer
 	scc = SimCardCommands(transport=sl)