[addrman] inline Clear() into CAddrMan ctor

Clear() is now only called from the ctor, so just inline the code into
that function.

The LOCK(cs) can be removed, since there can be no data races in the ctor.

Also move the function definition out of the header and into the cpp file.

src/addrman.cpp

@@ -77,6 +77,32 @@ double CAddrInfo::GetChance(int64_t nNow) const
     return fChance;
 }
 
+CAddrMan::CAddrMan(bool deterministic, int32_t consistency_check_ratio)
+    : insecure_rand{deterministic}
+    , m_consistency_check_ratio{consistency_check_ratio}
+{
+    std::vector<int>().swap(vRandom);
+    nKey = insecure_rand.rand256();
+    for (size_t bucket = 0; bucket < ADDRMAN_NEW_BUCKET_COUNT; bucket++) {
+        for (size_t entry = 0; entry < ADDRMAN_BUCKET_SIZE; entry++) {
+            vvNew[bucket][entry] = -1;
+        }
+    }
+    for (size_t bucket = 0; bucket < ADDRMAN_TRIED_BUCKET_COUNT; bucket++) {
+        for (size_t entry = 0; entry < ADDRMAN_BUCKET_SIZE; entry++) {
+            vvTried[bucket][entry] = -1;
+        }
+    }
+
+    nIdCount = 0;
+    nTried = 0;
+    nNew = 0;
+    nLastGood = 1; //Initially at 1 so that "never" is strictly worse.
+    mapInfo.clear();
+    mapAddr.clear();
+    if (deterministic) nKey = uint256{1};
+}
+
 CAddrInfo* CAddrMan::Find(const CNetAddr& addr, int* pnId)
 {
     AssertLockHeld(cs);

src/addrman.h

@@ -471,40 +471,7 @@ public:
         Check();
     }
 
-private:
-    void Clear()
-        EXCLUSIVE_LOCKS_REQUIRED(!cs)
-    {
-        LOCK(cs);
-        std::vector<int>().swap(vRandom);
-        nKey = insecure_rand.rand256();
-        for (size_t bucket = 0; bucket < ADDRMAN_NEW_BUCKET_COUNT; bucket++) {
-            for (size_t entry = 0; entry < ADDRMAN_BUCKET_SIZE; entry++) {
-                vvNew[bucket][entry] = -1;
-            }
-        }
-        for (size_t bucket = 0; bucket < ADDRMAN_TRIED_BUCKET_COUNT; bucket++) {
-            for (size_t entry = 0; entry < ADDRMAN_BUCKET_SIZE; entry++) {
-                vvTried[bucket][entry] = -1;
-            }
-        }
-
-        nIdCount = 0;
-        nTried = 0;
-        nNew = 0;
-        nLastGood = 1; //Initially at 1 so that "never" is strictly worse.
-        mapInfo.clear();
-        mapAddr.clear();
-    }
-
-public:
-    explicit CAddrMan(bool deterministic, int32_t consistency_check_ratio)
-        : insecure_rand{deterministic},
-          m_consistency_check_ratio{consistency_check_ratio}
-    {
-        Clear();
-        if (deterministic) nKey = uint256{1};
-    }
+    explicit CAddrMan(bool deterministic, int32_t consistency_check_ratio);
 
     ~CAddrMan()
     {
@@ -626,17 +593,16 @@ public:
         Check();
     }
 
-protected:
-    //! secret key to randomize bucket select with
-    uint256 nKey;
-
+private:
     //! A mutex to protect the inner data structures.
     mutable Mutex cs;
 
-private:
     //! Source of random numbers for randomization in inner loops
     mutable FastRandomContext insecure_rand GUARDED_BY(cs);
 
+    //! secret key to randomize bucket select with
+    uint256 nKey;
+
     //! Serialization versions.
     enum Format : uint8_t {
         V0_HISTORICAL = 0,    //!< historic format, before commit e6b343d88

src/test/addrman_tests.cpp

@@ -48,7 +48,7 @@ public:
         unsigned char nVersion = 1;
         s << nVersion;
         s << ((unsigned char)32);
-        s << nKey;
+        s << uint256::ONE;
         s << 10; // nNew
         s << 10; // nTried