dbChannel: shutdown from exitDatabase()

Can't cleanup dbChannel while rsrv or scan tasks
remain running.

src/ioc/db/dbChannel.c

@@ -53,7 +53,7 @@ static void *dbChannelFreeList;
 static void *chFilterFreeList;
 static void *dbchStringFreeList;
 
-static void dbChannelExit(void* junk)
+void dbChannelExit(void)
 {
     freeListCleanup(dbChannelFreeList);
     freeListCleanup(chFilterFreeList);
@@ -69,7 +69,6 @@ void dbChannelInit (void)
     freeListInitPvt(&dbChannelFreeList,  sizeof(dbChannel), 128);
     freeListInitPvt(&chFilterFreeList,  sizeof(chFilter), 64);
     freeListInitPvt(&dbchStringFreeList, sizeof(epicsOldString), 128);
-    epicsAtExit(dbChannelExit, NULL);
 }
 
 static void chf_value(parseContext *parser, parse_result *presult)

src/ioc/db/dbChannel.h

@@ -150,6 +150,7 @@ struct dbCommon;
 struct dbFldDes;
 
 epicsShareFunc void dbChannelInit (void);
+epicsShareFunc void dbChannelExit(void);
 epicsShareFunc long dbChannelTest(const char *name);
 epicsShareFunc dbChannel * dbChannelCreate(const char *name);
 epicsShareFunc long dbChannelOpen(dbChannel *chan);

src/ioc/misc/iocInit.c

@@ -683,6 +683,7 @@ int iocShutdown(void)
         iterateRecords(doFreeRecord, NULL);
         dbLockCleanupRecords(pdbbase);
         asShutdown();
+        dbChannelExit();
         iocshFree();
     }
     iocState = iocStopped;