Merge #20141: Avoid the use of abs64 in timedata

d1292f25f2 Avoid the use of abs64 in timedata (Pieter Wuille)

Pull request description:

  Fixes #20135.

ACKs for top commit:
  kallewoof:
    ACK d1292f25f2
  jonatack:
    ACK d1292f25f2 code/logic review, verified there are no remaining callers of `abs64()`, verified no warnings in a debug build
  practicalswift:
    ACK d1292f25f2
  MarcoFalke:
    ACK d1292f25f2 🎹

Tree-SHA512: d17e95c668eb5e02ea546433b3d1b5a0ccbfb2c9cec62fa67dad1844d7e278a2576fbc0b75bddbf4db9af7331e978148c7bef7fce7e6a07e0eb917ef1392f302

src/timedata.cpp

@@ -36,11 +36,6 @@ int64_t GetAdjustedTime()
     return GetTime() + GetTimeOffset();
 }
 
-static int64_t abs64(int64_t n)
-{
-    return (n >= 0 ? n : -n);
-}
-
 #define BITCOIN_TIMEDATA_MAX_SAMPLES 200
 
 void AddTimeData(const CNetAddr& ip, int64_t nOffsetSample)
@@ -79,7 +74,8 @@ void AddTimeData(const CNetAddr& ip, int64_t nOffsetSample)
         int64_t nMedian = vTimeOffsets.median();
         std::vector<int64_t> vSorted = vTimeOffsets.sorted();
         // Only let other nodes change our time by so much
-        if (abs64(nMedian) <= std::max<int64_t>(0, gArgs.GetArg("-maxtimeadjustment", DEFAULT_MAX_TIME_ADJUSTMENT))) {
+        int64_t max_adjustment = std::max<int64_t>(0, gArgs.GetArg("-maxtimeadjustment", DEFAULT_MAX_TIME_ADJUSTMENT));
+        if (nMedian >= -max_adjustment && nMedian <= max_adjustment) {
             nTimeOffset = nMedian;
         } else {
             nTimeOffset = 0;
@@ -89,7 +85,7 @@ void AddTimeData(const CNetAddr& ip, int64_t nOffsetSample)
                 // If nobody has a time different than ours but within 5 minutes of ours, give a warning
                 bool fMatch = false;
                 for (const int64_t nOffset : vSorted) {
-                    if (nOffset != 0 && abs64(nOffset) < 5 * 60) fMatch = true;
+                    if (nOffset != 0 && nOffset > -5 * 60 && nOffset < 5 * 60) fMatch = true;
                 }
 
                 if (!fMatch) {