[PATCH] spi: stm32-qspi: Fix W=1 build warning

[patrice.chotard at foss.st.com]

From: Patrice Chotard <patrice.chotard at foss.st.com>

Fix the following compilation warning using W=1 build:
arm-linux-gnueabi-ld: drivers/spi/spi-stm32-qspi.o: in function `stm32_qspi_poll_status':

Reported-by: kernel test robot <lkp at intel.com>
Signed-off-by: Patrice Chotard <patrice.chotard at foss.st.com>
---
 drivers/spi/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index f4481fe48bf0..e71a4c514f7b 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -806,6 +806,7 @@ config SPI_STM32_QSPI
 	tristate "STMicroelectronics STM32 QUAD SPI controller"
 	depends on ARCH_STM32 || COMPILE_TEST
 	depends on OF
+	depends on SPI_MEM
 	help
 	  This enables support for the Quad SPI controller in master mode.
 	  This driver does not support generic SPI. The implementation only
-- 
2.17.1