tap_init(): Added test for return value of the ioperm() call.

git-svn-id: https://urjtag.svn.sourceforge.net/svnroot/urjtag/trunk@129 b68d4a1b-bc3d-0410-92ed-d4ac073336b7

jtag/src/tap/ctrl.c

@@ -40,7 +40,11 @@ void
 tap_init( void )
 {
 	tap_state_init();
-	ioperm( port, 2, 1 );
+	printf( "Initilizing parallel TAP on port 0x%x\n", port );
+	if (ioperm( port, 2, 1 )) {
+		printf( "Error: Initialization failed!\n" );
+		return;
+	}
 	tap_state_set_trst( (inb( port ) >> TRST) & 1 );
 }