[gn][libfs] Fix shortening warning in block-txn.cpp

Pending gn host build will be more strict and reports:

[0->1/1 ~1] CXX host-x64-linux-clang/obj/system/ulib/fs/libfs.block-txn.cpp.o
../system/ulib/fs/block-txn.cpp:93:43: warning: implicit conversion loses integer precision: 'unsigned long' to 'uint32_t' (aka 'unsigned int') [-Wshorten-64-to-32]
            handler_->Writeblk(dev_offset + b, data);
                      ~~~~~~~~ ~~~~~~~~~~~^~~
../system/ulib/fs/block-txn.cpp:95:42: warning: implicit conversion loses integer precision: 'unsigned long' to 'uint32_t' (aka 'unsigned int') [-Wshorten-64-to-32]
            handler_->Readblk(dev_offset + b, data);
                      ~~~~~~~ ~~~~~~~~~~~^~~

ZX-3415 #comment [gn][libfs] Fix shortening warning in block-txn.cpp

Test: CQ
Change-Id: I1df3531502b627f6fac159629b5892016e165e69
1 file changed
tree: 31f9f8123cb1cbce83074f6fa6eaa752f66206d4
  1. boards/
  2. build/
  3. buildtools/
  4. bundles/
  5. docs/
  6. garnet/
  7. peridot/
  8. products/
  9. scripts/
  10. sdk/
  11. src/
  12. zircon/
  13. .clang-format
  14. .dir-locals.el
  15. .gitattributes
  16. .gitignore
  17. AUTHORS
  18. CODE_OF_CONDUCT.md
  19. CONTRIBUTING.md
  20. LICENSE
  21. OWNERS
  22. PATENTS
  23. README.md
  24. rustfmt.toml
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