libcamera: base: shared_fd: Rename fd() to get()

For consistency with UniqueFD, rename the fd() function to get().
Renaming UniqueFD::get() to fd() would have been another option, but was
rejected to keep as close as possible to the std::shared_ptr<> and
std::unique_ptr<> APIs.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>

src/libcamera/ipc_pipe.cpp

@@ -113,7 +113,7 @@ IPCUnixSocket::Payload IPCMessage::payload() const
 	}
 
 	for (const SharedFD &fd : fds_)
-		payload.fds.push_back(fd.fd());
+		payload.fds.push_back(fd.get());
 
 	return payload;
 }