optee: Fix a NULL vs IS_ERR() check

The tee_shm_get_va() function never returns NULL, it returns error
pointers.  Update the check to match.

Fixes: f0c8431568ee ("optee: probe RPMB device using RPMB subsystem")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Link: https://lore.kernel.org/r/f8c12aed-b5d1-4522-bf95-622b8569706d@stanley.mountain
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/tee/optee/rpc.c b/drivers/tee/optee/rpc.c
index a4b49fd1d46d7cce1fc38d709bf59bd99a9358b4..ebbbd42b0e3e72f4b222000c07d759509a74926e 100644 (file)
--- a/drivers/tee/optee/rpc.c
+++ b/drivers/tee/optee/rpc.c
@@ -332,7 +332,7 @@ static void handle_rpc_func_rpmb_probe_next(struct tee_context *ctx,
        }
        buf = tee_shm_get_va(params[1].u.memref.shm,
                             params[1].u.memref.shm_offs);
-       if (!buf) {
+       if (IS_ERR(buf)) {
                arg->ret = TEEC_ERROR_BAD_PARAMETERS;
                return;
        }