Squash compiler warnings #161

Job	Run time
hmda_analytics_tests	2m 47s
data_browser_tests	2m 41s
check_digit_tests	2m 23s
hmda_data_publisher_tests	3m 27s
hmda_platform_tests	2m 31s
hmda_quarterly_data_service_tests	2m 25s
common_tests	2m 28s
hmda_reporting_tests	2m 46s
institutions_api_tests	2m 27s
rate_limit_tests	2m 18s
modified_lar_tests	2m 20s
ratespread_calculator_tests	2m 22s
submission_errors_tests	2m 33s
	33m 28s

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