drivers: can: shell: fully initialize frame before sending

Zerorise the CAN frame before filling in data to ensure all data bytes are
initialized.

Fixes: #73309

Signed-off-by: Henrik Brix Andersen <[email protected]>
(cherry picked from commit fb4f67b)

Author: henrikbrixandersen

drivers/can/can_shell.c

@@ -676,7 +676,7 @@ static int cmd_can_send(const struct shell *sh, size_t argc, char **argv)
 	const struct device *dev = device_get_binding(argv[1]);
 	static unsigned int frame_counter;
 	unsigned int frame_no;
-	struct can_frame frame;
+	struct can_frame frame = { 0 };
 	uint32_t max_id;
 	int argidx = 2;
 	uint32_t val;