i2c: mxs: change error printing to debug for mxs_i2c_pio_wait_xfer_end

Instead of printing errors after mxs_i2c_pio_wait_xfer_end returns with
an error code just print a debug message.

NAKs and timeouts can occur in this situation normally, so do not treat
them as errors.
Signed-off-by: Michael Thalmeier <michael.thalmeier@hale.at>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

drivers/i2c/busses/i2c-mxs.c

@@ -419,7 +419,7 @@ static int mxs_i2c_pio_setup_xfer(struct i2c_adapter *adap,
 
 		ret = mxs_i2c_pio_wait_xfer_end(i2c);
 		if (ret) {
-			dev_err(i2c->dev,
+			dev_dbg(i2c->dev,
 				"PIO: Failed to send SELECT command!\n");
 			goto cleanup;
 		}
@@ -431,7 +431,7 @@ static int mxs_i2c_pio_setup_xfer(struct i2c_adapter *adap,
 
 		ret = mxs_i2c_pio_wait_xfer_end(i2c);
 		if (ret) {
-			dev_err(i2c->dev,
+			dev_dbg(i2c->dev,
 				"PIO: Failed to send READ command!\n");
 			goto cleanup;
 		}
@@ -528,7 +528,7 @@ static int mxs_i2c_pio_setup_xfer(struct i2c_adapter *adap,
 			/* Wait for the end of the transfer. */
 			ret = mxs_i2c_pio_wait_xfer_end(i2c);
 			if (ret) {
-				dev_err(i2c->dev,
+				dev_dbg(i2c->dev,
 					"PIO: Failed to finish WRITE cmd!\n");
 				break;
 			}