Impulsive stimulated light scattering was used to investigate structural relaxation dynamics of the organic glass-former salol. Relaxation dynamics on ns-ms time scales are monitored in the 238.7-280.5 K temperature range and found to be described well by the Kohlrausch-Williams-Watts relaxation function. The nonergodicity parameter f(q) of mode-coupling theory (MCT) in the limit of the small wave vector q is evaluated. Its temperature dependence shows a square-root cusp at a crossover temperature of T-c=266 K, consistent with neutron scattering measurements at high q and with light scattering results. This supports the MCT prediction of a cusp in f(q)(T) at a q-independent temperature.