fix(spi_nand): check that parameters have been set

This patch checks that the SPI NAND parameters needed by
the framework have been set before starting to read data.

Change-Id: I17b36606701c44864dcf1783f810da5c8cbf88f2
Signed-off-by: Christophe Kerello <christophe.kerello@foss.st.com>
Signed-off-by: Yann Gautier <yann.gautier@foss.st.com>
1 file changed