staging: vchiq_arm: Use devm_kzalloc() for vchiq_arm_state allocation

The struct vchiq_arm_state 'platform_state' is currently allocated
dynamically using kzalloc(). Unfortunately, it is never freed and is
subjected to memory leaks in the error handling paths of the probe()
function.

To address the issue, use device resource management helper
devm_kzalloc(), to ensure cleanup after its allocation.

Fixes: 71bad7f ("staging: add bcm2708 vchiq driver")
Cc: stable@vger.kernel.org
Signed-off-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://lore.kernel.org/r/20241016130225.61024-2-umang.jain@ideasonboard.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c

@@ -593,7 +593,7 @@ vchiq_platform_init_state(struct vchiq_state *state)
 {
 	struct vchiq_arm_state *platform_state;
 
-	platform_state = kzalloc(sizeof(*platform_state), GFP_KERNEL);
+	platform_state = devm_kzalloc(state->dev, sizeof(*platform_state), GFP_KERNEL);
 	if (!platform_state)
 		return -ENOMEM;