i2c: mux: only print failure message on error

As is, a failure message is printed unconditionally, which is confusing.
And noisy.

Fixes: 8d4d159f25a7 ("i2c: mux: provide more info on failure in i2c_mux_add_adapter")
Signed-off-by: Peter Rosin <peda@axentia.se>
1 file changed