firmware:syscallDo: fix eOsSensorSignalInternalEvt return value

This system call is basically using sensorSignalInternalEvt()
function that return a bool and not a SensorInfo pointer.

Change-Id: Ieaae795d109b697e34c83c65827152333af3b4d4
Signed-off-by: Denis Ciocca <denis.ciocca@st.com>
1 file changed