apps: qcam: Remove redundant check

The switch statement checks `roles.size()` with cases for 1 and 2,
so in the `default` branch, `role.size() > 2`, i.e. it is always
different from 1, so the check is unnecessary.

Signed-off-by: Barnabás Pőcze <pobrn@protonmail.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>

src/apps/qcam/main_window.cpp

@@ -381,11 +381,8 @@ int MainWindow::startCapture()
 		}
 		break;
 	default:
-		if (roles.size() != 1) {
-			qWarning() << "Unsupported stream configuration";
-			return -EINVAL;
-		}
-		break;
+		qWarning() << "Unsupported stream configuration";
+		return -EINVAL;
 	}
 
 	/* Configure the camera. */