Fix FieldUtils.getField false ambiguity on inherited interface field

[alhudz]

Repro: FieldUtils.getField(cls, "CONSTANT") where cls implements an interface that extends the interface actually declaring CONSTANT (or a diamond where two implemented interfaces share a common super-interface).
Cause: ClassUtils.getAllInterfaces also returns the transitively inherited interfaces, so class1.getField(fieldName) resolves the same Field more than once; the loop rejects on match == null alone and raises a false IllegalArgumentException about the field being ambiguous across two or more interfaces.
Fix: only reject when the newly found field differs (match == null || match.equals(test)). Field.equals compares declaring class, name and type, so the identical inherited field dedupes while two different fields on unrelated interfaces still throw.