Fix int -> unsigned.

[bmusb] / bmusb.cpp

diff --git a/bmusb.cpp b/bmusb.cpp
index fd323a66ffc42bc8a025ba4e6353f7e7a6c37acd..7c2108203f7904d76bdb9de9a49c8c1f3964ae3f 100644 (file)
--- a/bmusb.cpp
+++ b/bmusb.cpp
@@ -1011,10 +1011,10 @@ libusb_device_handle *open_card(unsigned card_index, libusb_device *dev, string
 
 }  // namespace
 
-int BMUSBCapture::num_cards()
+unsigned BMUSBCapture::num_cards()
 {
        vector<USBCardDevice> found_cards = find_all_cards();
-       int ret = found_cards.size();
+       unsigned ret = found_cards.size();
        for (size_t i = 0; i < found_cards.size(); ++i) {
                libusb_unref_device(found_cards[i].device);
        }