Bathtub Faucet

FIG. 1 is a top, front, right side perspective view of a bathtub faucet, showing my new design; FIG. 2 is a bottom, rear, left side perspective view thereof; FIG. 3 is a front elevational view thereof; FIG. 4 is a rear elevational view thereof; FIG. 5 is a left side elevational view thereof; FIG. 6 is a right side elevational view thereof; FIG. 7 is a top plan view thereof; FIG. 8 is a bottom plan view thereof; FIG. 9 is an enlarged view of portion 9 in FIG. 1 ; and, FIG. 10 is an enlarged view of portion 10 in FIG. 2 . The evenly dashed broken lines illustrate features of the bathtub faucet and form no part of the claimed design. The unevenly dashed broken lines define the boundaries of enlarged views and form no part of the claimed design.