Despite the documentation for the el_get(EL_GETTC) function claiming the
vararg part is (const char *name, void *value), in reality the function
expects the vararg list to be terminated by a null pointer, which can be
clearly seen by examining the source code. Although this is mostly
bening because the extra values are not used it any way, it still lights
up as an error when running the tests under msan.
Work around this quirk by adding an explicit nullptr to the end of the