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: f0c8431 ("optee: probe RPMB device using RPMB subsystem")
Signed-off-by: Dan Carpenter <[email protected]>
Reviewed-by: Jens Wiklander <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Ulf Hansson <[email protected]>

Author: Dan Carpenter

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;
 	}