fix test_i2c WriteReg coredump error

Ubiquitous/XiZi_IIoT/kernel/kernel_test/test_i2c.c

@@ -35,6 +35,7 @@
 #define ADDR                                  0x44                                      /* slave address */
 
 static struct Bus *i2c_bus = NONE;     /* I2C bus handle */
+static char addr = 0x44;
 
 typedef struct Hs300xData
 {
@@ -50,6 +51,9 @@ static x_err_t WriteReg(struct HardwareDev *dev)
 {
     struct BusBlockWriteParam write_param;
 
+    write_param.buffer = &addr;
+    write_param.size = 1;
+
     /* use I2C device API transfer data */
     if(1 == BusDevWriteData(dev, &write_param)) {
         return EOK;