BridgeManager: print error code when alt_setting function fail

.builds/ubuntu.yml

@@ -0,0 +1,23 @@
+image: ubuntu/lts
+
+sources:
+  - https://git.sr.ht/~grimler/Heimdall
+
+artifacts:
+  - Heimdall/build/bin/heimdall
+  - Heimdall/build/bin/heimdall-frontend
+
+packages:
+  - cmake
+  - g++
+  - pkg-config
+  - libusb-1.0-0-dev
+  - qtbase5-dev
+  - zlib1g-dev
+
+tasks:
+  - build: |
+      cd Heimdall
+      mkdir build && cd build
+      cmake -DCMAKE_BUILD_TYPE=Release ..
+      make -j8

heimdall/source/BridgeManager.cpp

@@ -265,7 +265,7 @@ bool BridgeManager::SetupDeviceInterface(void)
 
 	if (result != LIBUSB_SUCCESS)
 	{
-		Interface::PrintError("Setting up interface failed!\n");
+		Interface::PrintError("Setting up interface failed with error code %i!\n", result);
 		return (false);
 	}