Fix coding style problem in RngDxe driver.

Signed-off-by: Long, Qin <qin.long@intel.com>
Reviewed-by: Fu, Siyuan <siyuan.fu@intel.com>


git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14878 6f19259b-4bc3-4df7-8a09-765794883524

SecurityPkg/Application/RngTest/RngTest.c

@@ -103,6 +103,9 @@ UefiMain (
   //
   RandSize = 32;
   Rand     = AllocatePool (RandSize);
+  if (Rand == NULL) {
+    goto Exit;
+  }
   
   //
   // RNG with default algorithm