swim: Release memory region after incorrect return/goto

The code uses

	return foo;
	goto err_type;

when instead the form should have been

	ret = foo;
	goto err_type;

Here this causes a useful release_mem_region to be skipped.
Signed-off-by: Joe Perches <joe@perches.com>
Reviewed-by: Laurent Vivier <Laurent@Vivier.EU>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

drivers/block/swim.c

@@ -893,7 +893,7 @@ static int swim_probe(struct platform_device *dev)
 
 	swim_base = ioremap(res->start, resource_size(res));
 	if (!swim_base) {
-		return -ENOMEM;
+		ret = -ENOMEM;
 		goto out_release_io;
 	}