wininet: ensure null check before dereference

[Jeff Latimer]

Coverity cid: 367 Do the null check before the dereference.  Given that 
this is an simple internal function, do we need to check for null pointers?

Jeff Latimer
---
  dlls/wininet/utility.c |    4 ++--
  1 files changed, 2 insertions(+), 2 deletions(-)
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