BaseTools/VfrCompile: Fix potential memory leak

Cc: Liming Gao <liming.gao@intel.com>
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Dandan Bi <dandan.bi@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

BaseTools/Source/C/VfrCompile/VfrFormPkg.cpp

@@ -113,6 +113,7 @@ CFormPkg::CFormPkg (
   }
   BufferStart = new CHAR8[BufferSize];
   if (BufferStart == NULL) {
+    delete Node;
     return;
   }
   BufferEnd   = BufferStart + BufferSize;