[PATCH] MdePkg/UefiDebugLibStdErr: Pass the correct buffer size

["Marvin Häuser" <Marvin.Haeuser@outlook.com>]

From: Marvin Haeuser <mhaeuser@outlook.de>

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2302

The second argument of "UnicodeVSPrintAsciiFormat" is "BufferSize",
which takes the size of the buffer in bytes. Replace the currently
used MAX_DEBUG_MESSAGE_LENGTH usage, which is the buffer's length,
with the actual buffer size.

Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Marvin Haeuser <mhaeuser@outlook.de>
---
 MdePkg/Library/UefiDebugLibStdErr/DebugLib.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/MdePkg/Library/UefiDebugLibStdErr/DebugLib.c b/MdePkg/Library/UefiDebugLibStdErr/DebugLib.c
index 40eb697e7e2c..fcfdafede08f 100644
--- a/MdePkg/Library/UefiDebugLibStdErr/DebugLib.c
+++ b/MdePkg/Library/UefiDebugLibStdErr/DebugLib.c
@@ -106,9 +106,9 @@ DebugPrintMarker (
     // Convert the DEBUG() message to a Unicode String
     //
     if (BaseListMarker == NULL) {
-      UnicodeVSPrintAsciiFormat (Buffer, MAX_DEBUG_MESSAGE_LENGTH, Format, VaListMarker);
+      UnicodeVSPrintAsciiFormat (Buffer, sizeof (Buffer), Format, VaListMarker);
     } else {
-      UnicodeBSPrintAsciiFormat (Buffer, MAX_DEBUG_MESSAGE_LENGTH, Format, BaseListMarker);
+      UnicodeBSPrintAsciiFormat (Buffer, sizeof (Buffer), Format, BaseListMarker);
     }
 
     //
-- 
2.23.0.windows.1