Initialize UAPI structs copied to user space

To not leak any information from kernel space when IOCTL calls copy data
from kernel space to user space, the source struct in the IOCTL calls is
now initialized.

Change-Id: I0825e82ccdb51ced747e160dd7385fa1ed227eaf
Signed-off-by: Mikael Olsson <mikael.olsson@arm.com>
diff --git a/kernel/ethosu_network.c b/kernel/ethosu_network.c
index 71ae484..dc641c5 100644
--- a/kernel/ethosu_network.c
+++ b/kernel/ethosu_network.c
@@ -111,7 +111,7 @@
 
 	switch (cmd) {
 	case ETHOSU_IOCTL_NETWORK_INFO: {
-		struct ethosu_uapi_network_info uapi;
+		struct ethosu_uapi_network_info uapi = { 0 };
 
 		dev_info(dev, "Network ioctl: Network info. net=0x%pK\n", net);