no-value-for-parameter variadic detection has improved for assign statements

[PCManticore]

Description

The problem was caused by the exemption of variadics for no-value-for-parameter not being smart enough when deciding if a statement should be included or not. Previously only return statements or expressions were taking in consideration, but right hand side of assignments should also be exempted when dealing with variadics.

Type of Changes

	Type
✓	🐛 Bug fix

Related Issue

Close #3563

[coveralls]

Coverage decreased (-0.04%) to 90.387% when pulling ac8a5da on no-value-for-param-false-positive into 1654e49 on 2.5.

[coveralls]

Coverage decreased (-0.04%) to 90.387% when pulling ac8a5da on no-value-for-param-false-positive into 1654e49 on 2.5.

[coveralls]

Coverage remained the same at 90.431% when pulling ac8a5da on no-value-for-param-false-positive into 1654e49 on 2.5.