tools:iio:generic_buffer: free dev_dir_name on exit

Make sure to free dev_dir_name in case of an error or regular exit.
Signed-off-by: Hartmut Knaack <knaack.h@gmx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

tools/iio/generic_buffer.c

@@ -220,7 +220,7 @@ int main(int argc, char **argv)
 				       "%s-dev%d", device_name, dev_num);
 			if (ret < 0) {
 				ret = -ENOMEM;
-				goto error_ret;
+				goto error_free_dev_dir_name;
 			}
 		}
 
@@ -354,6 +354,8 @@ int main(int argc, char **argv)
 error_free_triggername:
 	if (datardytrigger)
 		free(trigger_name);
+error_free_dev_dir_name:
+	free(dev_dir_name);
 error_ret:
 	return ret;
 }