command: Add a command_encode_and_frame() helper

Add a helper function that calls command_encodef() followed by
command_add_frame().

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

src/linux/console.c

@@ -176,8 +176,7 @@ console_sendf(const struct command_encoder *ce, va_list args)
 {
     // Generate message
     uint8_t buf[MESSAGE_MAX];
-    uint_fast8_t msglen = command_encodef(buf, ce, args);
-    command_add_frame(buf, msglen);
+    uint_fast8_t msglen = command_encode_and_frame(buf, ce, args);
 
     // Transmit message
     int ret = write(main_pfd[MP_TTY_IDX].fd, buf, msglen);