scripted-diff: Replace nNextSweep with m_next_sweep

-BEGIN VERIFY SCRIPT-
sed -i 's/nNextSweep/m_next_sweep/g' $(git grep -l 'nNextSweep')
-END VERIFY SCRIPT-

fixing to match style

src/txorphanage.cpp

@@ -120,7 +120,7 @@ void TxOrphanage::LimitOrphans(unsigned int max_orphans, FastRandomContext& rng)
 
     unsigned int nEvicted = 0;
     auto nNow{Now<NodeSeconds>()};
-    if (nNextSweep <= nNow) {
+    if (m_next_sweep <= nNow) {
         // Sweep out expired orphan pool entries:
         int nErased = 0;
         auto nMinExpTime{nNow + ORPHAN_TX_EXPIRE_TIME - ORPHAN_TX_EXPIRE_INTERVAL};
@@ -135,7 +135,7 @@ void TxOrphanage::LimitOrphans(unsigned int max_orphans, FastRandomContext& rng)
             }
         }
         // Sweep again 5 minutes after the next entry that expires in order to batch the linear scan.
-        nNextSweep = nMinExpTime + ORPHAN_TX_EXPIRE_INTERVAL;
+        m_next_sweep = nMinExpTime + ORPHAN_TX_EXPIRE_INTERVAL;
         if (nErased > 0) LogPrint(BCLog::TXPACKAGES, "Erased %d orphan tx due to expiration\n", nErased);
     }
     while (m_orphans.size() > max_orphans)

src/txorphanage.h

@@ -107,7 +107,7 @@ protected:
     int EraseTxNoLock(const Wtxid& wtxid) EXCLUSIVE_LOCKS_REQUIRED(m_mutex);
 
     /** Timestamp for the next scheduled sweep of expired orphans */
-    NodeSeconds nNextSweep GUARDED_BY(m_mutex){0s};
+    NodeSeconds m_next_sweep GUARDED_BY(m_mutex){0s};
 };
 
 #endif // BITCOIN_TXORPHANAGE_H