spi: cf_qspi: Fixup to_cf_qspi_slave macro

The third parameter of container_of is the name of the member within the struct.
Current code only works if the parameter passed to to_cf_qspi_slave named slave.
Fix it.
Signed-off-by: NAxel Lin <axel.lin@ingics.com>
Reviewed-by: NJagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>

drivers/spi/cf_qspi.c

@@ -20,7 +20,7 @@
 DECLARE_GLOBAL_DATA_PTR;
 
 #define clamp(x, low, high) (min(max(low, x), high))
-#define to_cf_qspi_slave(s) container_of(s, struct cf_qspi_slave, s)
+#define to_cf_qspi_slave(s) container_of(s, struct cf_qspi_slave, slave)
 
 struct cf_qspi_slave {
 	struct spi_slave slave;	/* Specific bus:cs ID for each device */