MdeModulePkg/UdfDxe: suppress incorrect compiler warning in ReadFile()
When building the driver for DEBUG/RELEASE, GCC48/GCC49 warn about
ReadFile() possibly using "BytesLeft" without initializing it first.
This is not the case. The reads of "BytesLeft" are only reachable if
(ReadFileInfo->Flags == READ_FILE_SEEK_AND_READ). But, in that case, we
also set "BytesLeft" to "ReadFileInfo->FileDataSize", near the top of the
function.
Assign "BytesLeft" zero at the top, and add a comment that conforms to the
pending Coding Style Spec feature request at
<https://bugzilla.tianocore.org/show_bug.cgi?id=607>.
This issue was reported by Ard's and Gerd's CI systems independently.
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Eric Dong <eric.dong@intel.com> Cc: Paulo Alcantara <pcacjr@zytor.com> Cc: Ruiyu Ni <ruiyu.ni@intel.com> Cc: Star Zeng <star.zeng@intel.com> Reported-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reported-by: Gerd Hoffmann <kraxel@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Star Zeng <star.zeng@intel.com> Reviewed-by: Paulo Alcantara <pcacjr@zytor.com>