opti:rm useless code

include/libs/wal/wal.h

@@ -206,7 +206,6 @@ void        walReaderValidVersionRange(SWalReader *pReader, int64_t *sver, int64
 void        walReaderVerifyOffset(SWalReader *pWalReader, STqOffsetVal* pOffset);
 
 // only for tq usage
-void    walSetReaderCapacity(SWalReader *pRead, int32_t capacity);
 int32_t walFetchHead(SWalReader *pRead, int64_t ver);
 int32_t walFetchBody(SWalReader *pRead);
 int32_t walSkipFetchBody(SWalReader *pRead);

source/libs/wal/src/walRead.c

@@ -250,7 +250,6 @@ int32_t walReaderSeekVer(SWalReader *pReader, int64_t ver) {
   return 0;
 }
 
-void walSetReaderCapacity(SWalReader *pRead, int32_t capacity) { pRead->capacity = capacity; }
 
 int32_t walFetchHead(SWalReader *pRead, int64_t ver) {
   int64_t code;