OvmfPkg: PlatformDebugLibIoPort: fix AsciiSPrint() format string

OvmfPkg: PlatformDebugLibIoPort: fix AsciiSPrint() format string

The LineNumber parameter of the DebugAssert() function has type UINTN.
DebugAssert() passes it to AsciiSPrint() with the %d conversion specifier
at the moment, but %d would require an INT32 argument.

Fix this by casting LineNumber to UINT64, also employing the matching
decimal conversion specifier, %Lu.

(Another possibility would be to cast LineNumber to INT32, but a
UINTN->INT32 cast is not value preserving, generally speaking.)

Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Scott Duplichan <scott@notabs.org>
Reported-by: Scott Duplichan <scott@notabs.org>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18173 6f19259b-4bc3-4df7-8a09-765794883524