Add a missing forward declaration.

diff --git a/bmusb.h b/bmusb.h
index 9b74730cb056721dfa7038fbc1010d0a61e221fb..301350f53be858fac1885f0821920bdbac600e2c 100644 (file)
--- a/bmusb.h
+++ b/bmusb.h
@@ -10,6 +10,8 @@
 #include <thread>
 #include <vector>
 
+struct libusb_transfer;
+
 // An interface for frame allocators; if you do not specify one
 // (using set_video_frame_allocator), a default one that pre-allocates
 // a freelist of eight frames using new[] will be used. Specifying