Increase the retry count while probing for I2C sensors. This will also unwedge stuck sensors.

apps/drivers/hmc5883/hmc5883.cpp

@@ -339,12 +339,14 @@ HMC5883::close_last(struct file *filp)
 int
 HMC5883::probe()
 {
-	uint8_t data[3];
+	uint8_t data[3] = {0, 0, 0};
 
+	_retries = 3;
 	if (read_reg(ADDR_ID_A, data[0]) ||
 	    read_reg(ADDR_ID_B, data[1]) ||
 	    read_reg(ADDR_ID_C, data[2]))
 		debug("read_reg fail");
+	_retries = 1;
 
 	if ((data[0] != ID_A_WHO_AM_I) ||
 	    (data[1] != ID_B_WHO_AM_I) ||

apps/drivers/ms5611/ms5611.cpp

@@ -317,11 +317,12 @@ MS5611::close_last(struct file *filp)
 int
 MS5611::probe()
 {
-	if (OK == probe_address(MS5611_ADDRESS_1))
-		return OK;
-
-	if (OK == probe_address(MS5611_ADDRESS_2))
+	_retries = 3;
+	if((OK == probe_address(MS5611_ADDRESS_1)) ||
+	   (OK == probe_address(MS5611_ADDRESS_2))) {
+	   	_retries = 1;
 		return OK;
+	}
 
 	return -EIO;
 }