msi: Fix some possible NULL pointer dereferences. (Coverity)

[Mike McCormack]

---

  dlls/msi/msi.c       |    3 +++
  dlls/msi/package.c   |    3 +++
  dlls/msi/registry.c  |    3 +++
  dlls/msi/tests/msi.c |   16 ++++++++++++++++
  4 files changed, 25 insertions(+), 0 deletions(-)

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