MdeModulePkg UhciPei: Also check TempPtr against NULL to return error

Cc: Hao Wu <hao.a.wu@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Hao Wu <hao.a.wu@intel.com>
(cherry picked from commit 56fb9faa60)

MdeModulePkg/Bus/Pci/UhciPei/UhcPeim.c

@@ -2863,8 +2863,8 @@ CreateMemoryBlock (
              &MappedAddr,
              &Mapping
              );
-  if (EFI_ERROR (Status)) {
-    return Status;
+  if (EFI_ERROR (Status) || (TempPtr == NULL)) {
+    return EFI_OUT_OF_RESOURCES;
   }
 
   Ptr = TempPtr;