Use osmo_libusb_{init,exit}() instead of libusb_{init,exit}()

We use other osmo_libusb_* functions later in the code, so it is best
to initialize the library via libosmousb, and not directly.

Change-Id: I2fd981935e1420e529f5dd8a98edd347c317284c

host/src/simtrace2-cardem-pcsc.c

@@ -633,7 +633,7 @@ close_exit:
 	if (transp->usb_devh)
 		libusb_close(transp->usb_devh);
 
-	libusb_exit(NULL);
+	osmo_libusb_exit(NULL);
 do_exit:
 	return ret;
 }

host/src/simtrace2-sniff.c

@@ -379,7 +379,7 @@ int main(int argc, char **argv)
 	}
 
 	/* Scan for available SIMtrace USB devices supporting sniffing */
-	rc = libusb_init(NULL);
+	rc = osmo_libusb_init(NULL);
 	if (rc < 0) {
 		fprintf(stderr, "libusb initialization failed\n");
 		goto do_exit;
@@ -505,7 +505,7 @@ close_exit:
 			sleep(1);
 	} while (keep_running);
 
-	libusb_exit(NULL);
+	osmo_libusb_exit(NULL);
 do_exit:
 	return ret;
 }

host/src/simtrace2-tool.c

@@ -265,7 +265,7 @@ int main(int argc, char **argv)
 
 	transp->udp_fd = -1;
 
-	rc = libusb_init(NULL);
+	rc = osmo_libusb_init(NULL);
 	if (rc < 0) {
 		fprintf(stderr, "libusb initialization failed\n");
 		goto do_exit;
@@ -326,7 +326,7 @@ close_exit:
 			libusb_close(transp->usb_devh);
 	} while (0);
 
-	libusb_exit(NULL);
+	osmo_libusb_exit(NULL);
 do_exit:
 	return ret;
 }

host/src/simtrace2_usb.c

@@ -77,7 +77,7 @@ static int find_devices(void)
 
 int main(int argc, char **argv)
 {
-	libusb_init(NULL);
+	osmo_libusb_init(NULL);
 	find_devices();
 	return 0;
 }