spi: tegra: don't treat NULL clk as an error

Some platforms have been known to return NULL from clk_get() if they
support only a single struct clk.  Whilst tegra doesn't do this, make
the drivers consistent with others.

Signed-off-by: Jamie Iles <[email protected]>
Acked-by: Russell King <[email protected]>
Signed-off-by: Grant Likely <[email protected]>
1 file changed