md: fix build failure for !MODULE

After merging the block tree, today's linux-next build (x86_64
allmodconfig) failed like this:

drivers/md/md.c:717:22: error: 'mddev_find' defined but not used [-Werror=unused-function]
  717 | static struct mddev *mddev_find(dev_t unit)
      |                      ^~~~~~~~~~
cc1: all warnings being treated as errors

Caused by commit

  4500d5c17910 ("md: simplify md_open")

Make mddev_find() available only for non-modular builds.
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220721131132.070be166@canb.auug.org.auSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/md/md.c

@@ -714,6 +714,7 @@ static dev_t mddev_alloc_unit(void)
 	return dev;
 }
 
+#ifndef MODULE
 static struct mddev *mddev_find(dev_t unit)
 {
 	struct mddev *mddev;
@@ -729,6 +730,7 @@ static struct mddev *mddev_find(dev_t unit)
 
 	return mddev;
 }
+#endif
 
 static struct mddev *mddev_alloc(dev_t unit)
 {