Merge bitcoin#21929: fuzz: Remove incorrect float round-trip serialization test

fae814c fuzz: Remove incorrect float round-trip serialization test (MarcoFalke)

Pull request description:

  It tests the wrong way of the round-trip: `int -> float -> int`, but only `float -> int -> float` is allowed and used. See also `src/test/fuzz/float.cpp`.

  Hopefully fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=34118

ACKs for top commit:
  laanwj:
    Anyhow, ACK fae814c

Tree-SHA512: 8412a7985be2225109f382b7c7ea6d6fcfbea15711671fdf2f41dd1a9adbb3b4489592863751d78bedaff98e9b0b13571d9cae06ffd92db8fbf7ce0f47874a41

Author: laanwj

src/test/fuzz/integer.cpp

@@ -122,10 +122,6 @@ FUZZ_TARGET_INIT(integer, initialize_integer)
         assert(dynamic_usage == incremental_dynamic_usage * i64s.size());
     }
     (void)MillisToTimeval(i64);
-    const double d = ser_uint64_to_double(u64);
-    assert(ser_double_to_uint64(d) == u64);
-    const float f = ser_uint32_to_float(u32);
-    assert(ser_float_to_uint32(f) == u32);
     (void)SighashToStr(uch);
     (void)SipHashUint256(u64, u64, u256);
     (void)SipHashUint256Extra(u64, u64, u256, u32);