This commit refines the logic for the CvtNum function. It avoids using the
decrement operator '--' for array index to prevent possible mis-reports by
static code checkers.

Cc: Fu Siyuan <siyuan...@intel.com>
Cc: Ye Ting <ting...@intel.com>
Cc: Wu Jiaxin <jiaxin...@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hao Wu <hao.a...@intel.com>
---
 MdeModulePkg/Universal/Network/UefiPxeBcDxe/PxeBcSupport.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/MdeModulePkg/Universal/Network/UefiPxeBcDxe/PxeBcSupport.c 
b/MdeModulePkg/Universal/Network/UefiPxeBcDxe/PxeBcSupport.c
index 0865ddd..0779056 100644
--- a/MdeModulePkg/Universal/Network/UefiPxeBcDxe/PxeBcSupport.c
+++ b/MdeModulePkg/Universal/Network/UefiPxeBcDxe/PxeBcSupport.c
@@ -132,11 +132,10 @@ CvtNum (
 {
   UINTN Remainder;
 
-  while (Length > 0) {
+  for (; Length > 0; Length--) {
     Remainder = Number % 10;
     Number /= 10;
-    Length--;
-    Buffer[Length] = (UINT8) ('0' + Remainder);
+    Buffer[Length - 1] = (UINT8) ('0' + Remainder);
   }
 }
 
-- 
1.9.5.msysgit.0

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