stm32f4 SPI-flash: Remove unnecessary delay after CS-off

Author: danielinux

hal/spi/spi_drv_stm32f4.c

@@ -30,12 +30,9 @@
 
 void spi_cs_off(void)
 {
-    int i;
     GPIOE_BSRR |= (1 << SPI_FLASH_PIN);
     while(!(GPIOE_ODR & (1 << SPI_FLASH_PIN)))
         ;
-    for(i = 0; i < 168000; i++)
-        ;
 }
 
 void spi_cs_on(void)