test/getrandom-fallbacks.c: Fix 'STRING_NULL' found by Covscan.
test/getrandom-fallbacks.c: Fix 'STRING_NULL' found by Covscan.

CWE-170: String not null terminated (STRING_NULL)

string_null: Passing unterminated string dbuf to strcmp,
which expects a null-terminated string.

besser82/libxcrypt,besser82/libxcrypt,besser82/libxcrypt,besser82/libxcrypt