misc: fastrpc: fix memory leak when out of memory

Do the necessary house-keeping if the allocated memory wont be used

Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
Link: https://lore.kernel.org/r/20190705081303.14170-1-jorge.ramirez-ortiz@linaro.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>