crimson/os/seastore/record_scanner: replace [=] capturing

Capturing with = is error prone and causes compile warning.

And it is wrong:
* cursor should be captured by reference
* mutable keyword is unnecessary

Signed-off-by: Yingxin Cheng <yingxin.cheng@intel.com>

diff --git a/src/crimson/os/seastore/record_scanner.cc b/src/crimson/os/seastore/record_scanner.cc
index 77f7cb422acf67b56966e29b7647832703114a4e..5fab11505cef61d880336199d14384f468d03f3b 100644 (file)
--- a/src/crimson/os/seastore/record_scanner.cc
+++ b/src/crimson/os/seastore/record_scanner.cc
@@ -120,7 +120,7 @@ RecordScanner::read_validate_record_metadata(
   }
   TRACE("reading record group header block {}~4096", start);
   return read(start, block_size
-  ).safe_then([=](bufferptr bptr) mutable
+  ).safe_then([this, FNAME, nonce, block_size, &cursor](bufferptr bptr)
               -> read_validate_record_metadata_ret {
     bufferlist bl;
     bl.append(bptr);