stm32f4xx_spi: do not use nss GPIO handle unless it is actually valid

Change-Id: I994d49d355862dc0338184608269f0a525e13945
1 file changed
tree: a2406d9339555f5a684647b2a284caf425d02ce8
  1. firmware/
  2. util/
  3. .gitignore
  4. CodingStandard.txt