The ornamental design for a latch actuator, as shown and described.
FIG. 1 is a right side isometric view of a latch actuator;
FIG. 2 is a left side isometric view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a front elevation view thereof;
FIG. 6 is a rear elevation view thereof;
FIG. 7 is a right side elevation view thereof;
FIG. 8 is a left side elevation view thereof;
FIG. 9 is a cross-sectional view thereof taken along lines 9-9 shown in FIG. 7; and,
FIG. 10 is a right side isometric view thereof.
The broken line showing of the latch actuator is for the purpose of illustrating portions of the latch actuator and forms no part of the claimed design.