iov_iter: export import_single_range()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index bc6d85c..5fecddc 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -849,3 +849,4 @@
 	iov_iter_init(i, rw, iov, 1, len);
 	return 0;
 }
+EXPORT_SYMBOL(import_single_range);