cppcheck: work around snprintf warning

cppcheck: work around snprintf warning

Cppcheck 1.72 gives a warning on the following code pattern:

    char blah[32] = "";
    snprintf(blah, sizeof(blah), "something");

The warning is:

    (error) Buffer is accessed out of bounds.

While this appears to be a FP, in most cases the initialization to ""
was unnecessary as the snprintf statement immediately follows the
variable declaration.