addrman: change asserts to Assumes

`Assume` is safer since the checks are non-fatal- errors in these functions
should provide feedback in debug builds, but do not need to deter further node
operations in production.

src/addrman.cpp

@@ -764,9 +764,7 @@ std::pair<CAddress, NodeSeconds> AddrManImpl::Select_(bool new_only, std::option
             if (node_id != -1) {
                 if (network.has_value()) {
                     const auto it{mapInfo.find(node_id)};
-                    assert(it != mapInfo.end());
-                    const auto info{it->second};
-                    if (info.GetNetwork() == *network) break;
+                    if (Assume(it != mapInfo.end()) && it->second.GetNetwork() == *network) break;
                 } else {
                     break;
                 }
@@ -796,15 +794,17 @@ int AddrManImpl::GetEntry(bool use_tried, size_t bucket, size_t position) const
 {
     AssertLockHeld(cs);
 
-    assert(position < ADDRMAN_BUCKET_SIZE);
-
     if (use_tried) {
-        assert(bucket < ADDRMAN_TRIED_BUCKET_COUNT);
-        return vvTried[bucket][position];
+        if (Assume(position < ADDRMAN_BUCKET_SIZE) && Assume(bucket < ADDRMAN_TRIED_BUCKET_COUNT)) {
+            return vvTried[bucket][position];
+        }
     } else {
-        assert(bucket < ADDRMAN_NEW_BUCKET_COUNT);
-        return vvNew[bucket][position];
+        if (Assume(position < ADDRMAN_BUCKET_SIZE) && Assume(bucket < ADDRMAN_NEW_BUCKET_COUNT)) {
+            return vvNew[bucket][position];
+        }
     }
+
+    return -1;
 }
 
 std::vector<CAddress> AddrManImpl::GetAddr_(size_t max_addresses, size_t max_pct, std::optional<Network> network) const

src/addrman_impl.h

@@ -255,7 +255,7 @@ private:
 
     /** Helper to generalize looking up an addrman entry from either table.
      *
-     *  @return  int The nid of the entry or -1 if the addrman position is empty.
+     *  @return  int The nid of the entry. If the addrman position is empty or not found, returns -1.
      * */
     int GetEntry(bool use_tried, size_t bucket, size_t position) const EXCLUSIVE_LOCKS_REQUIRED(cs);