fix corrupted smc_fastcall returned error code TBUG-464

Change-Id: Icb42107b5ffae75d99cbcd5f3d6da8add4313dfc
Signed-off-by: Sylvain Trosset <trosset.sylvain@gmail.com>
Git-commit: ac218c2c0b414e1a97dc2b7094d1a18c7b4960cd
Git-repo: https://code.google.com/p/tee-mobicore-driver.kernel/


Acked-by: Tony Hamilton <tonyh@qti.qualcomm.com>
Signed-off-by: Keith Fallows <keithf@codeaurora.org>