[U-Boot] soft_spi.c crash while saveenv

[Horst Gall]

Hi Wolfgang,

I used the soft_spi - driver for saving the u-boot-environment.

When I started "saveenv" u-boot hang - no output.
I located the problem in soft_spi.c in function "spi_xfer()".
This function writes every byte received from the spi-device to the pointer 
"dout".
In case of writing to the spi-device the returned bytes are also written to 
the dout-pointer.

The function "spi_flash_cmd()" in "drivers/mtd/spi/spi_flash.c" calls now 
this function with
a NULL-pointer.

I fiexed the problem in soft_spi.c and attached the file.


Best regards
Horst Gall 
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