The ornamental design for an x-ray scanner, as shown and described.
FIG. 1 is a perspective view showing our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a left side elevational view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines in the drawing views are included for the purpose of illustrating unclaimed portions of the x-ray scanner and form no part of the claimed design.