The chips variable needs to be incremented for each chip that is
found in the spi_present_mask when registering via device tree.
Without this and the checking a negative index is passed to the
data->chip array in a subsequent loop.

Cc: stable@vger.kernel.org
Signed-off-by: NMichael Welling <mwelling@ieee.org>
Acked-by: NPeter Korsgaard <peter@korsgaard.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>