Check the return value from pipe(2)

Starting from GCC 10 not checking this will produce a warning.

src/wine-host/bridges/group.cpp

@@ -66,7 +66,9 @@ StdIoCapture::StdIoCapture(boost::asio::io_context& io_context,
       original_fd_copy(dup(file_descriptor)) {
     // We'll use the second element of these two file descriptors to reopen
     // `file_descriptor`, and the first one to read the captured contents from
-    ::pipe(pipe_fd);
+    if (::pipe(pipe_fd) != 0) {
+        throw std::system_error(errno, std::system_category());
+    }
 
     // We've already created a copy of the original file descriptor, so we can
     // reopen it using the newly created pipe

src/wine-host/bridges/group.h

@@ -45,6 +45,8 @@ class StdIoCapture {
      *
      * @param io_context The IO context to create the captured pipe stream on.
      * @param file_descriptor The file descriptor to remap.
+     *
+     * @throw std::system_error If the pipe could not be created.
      */
     StdIoCapture(boost::asio::io_context& io_context, int file_descriptor);
 
@@ -111,6 +113,7 @@ class GroupBridge {
      *   `create_logger_prefix()` function in `./group.cpp`.
      *
      * @throw boost::system::system_error If we can't listen on the socket.
+     * @throw std::system_error If the pipe could not be created.
      *
      * @note Creating an `GroupBridge` instance has the side effect that the
      *   STDOUT and STDERR streams of the current process will be redirected to

src/wine-host/group-host.cpp

@@ -78,6 +78,11 @@ int __cdecl main(int argc, char* argv[]) {
                   << std::endl;
         std::cerr << error.what() << std::endl;
 
+        return 0;
+    } catch (const std::system_error& error) {
+        std::cerr << "Could not create pipe:" << std::endl;
+        std::cerr << error.what() << std::endl;
+
         return 0;
     }
 }