Add missing va_end() calls in some variadic functions.

This addresses the following cppcheck reports:
[dumpstate/utils.cpp:666]: (error)
  va_list 'ap' was opened but not closed by va_end().
[dumpstate/utils.cpp:703]: (error)
  va_list 'ap' was opened but not closed by va_end().

Change-Id: I2405f063a6da1a109192484577bc18f5f40f2b99