Fix fake composite device code to use a fixed order

The value static_interface shall be incremented only for composite devices.
Otherwise any other reader would increase the value and the next
composite reader connected will have its interfaces enumerated in a
different order.

The problem occurs only on Mac OS X (pcscd) that still does not support
composite CCID devices. The CCID driver has to be configured with
--enable-composite-as-multislot and composite CCID devices are
"emulated" as a multi-slot device.

Thanks to Godfrey Chung for the patch
#19

src/ccid_usb.c

@@ -622,12 +622,17 @@ status_t OpenUSBByName(unsigned int reader_index, /*@null@*/ char *device)
 				}
 
 #ifdef USE_COMPOSITE_AS_MULTISLOT
-				/* use the next interface for the next "slot" */
-				static_interface++;
+				if ((GEMALTOPROXDU == readerID)
+					|| (GEMALTOPROXSU == readerID)
+					|| (FEITIANR502DUAL == readerID))
+				{
+					/* use the next interface for the next "slot" */
+					static_interface++;
 
-				/* reset for a next reader */
-				if (static_interface > 2)
-					static_interface = (FEITIANR502DUAL == readerID) ? 0: 1;
+					/* reset for a next reader */
+					if (static_interface > 2)
+						static_interface = (FEITIANR502DUAL == readerID) ? 0: 1;
+				}
 #endif
 
 				/* Get Endpoints values*/