[media] RedRat3: Return directly after a failed kcalloc() in redrat3_transmit_ir()

* Return directly after a call of the function "kcalloc" failed
  at the beginning.

* Reorder two calls for the function "kfree" at the end.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>