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Updated German translation.
AudioSwitcher: Fix the initialization of the normalization factor.

The variable m_normalizeFactor depends of m_nMaxNormFactor in the initialization list so the declaration order has to take that into account.
AudioSwitcher: Use the defines for the max and min values of a 24-bit integer.
BaseSplitterFileEx: Fix an incorrect check.

This check was always wrong.
BaseSplitterFileEx: Simplify a check.

h.bitpersample is unsigned, checking if it's greater than 0 will always be true.
BufferFilter: Check for null pointers before actually using them.
ComPropertySheet: Remove a redundant check.
FGManagerBDA: Check for null pointer before actually using it.
IPinHook: Fix wrong sizeof.
PPageFileInfoClip: Use CComBSTR Length method when possible.