Fixed warnings in MSVC.

It complained about undefined return values or using uninitialized variables.

src/MobCensus.cpp

@@ -48,6 +48,10 @@ int cMobCensus::GetCapMultiplier(cMonster::eFamily a_MobFamily)
 			return -1;
 		}
 	}
+	#if !defined(__clang__)
+		ASSERT(!"Unknown mob family");
+		return -1;
+	#endif
 }