atmel_nand: check gpio validity before using it
else we get : "invalid GPIO -22"
(as enable_pin is EINVAL)

tested on SAMA5D35

Signed-off-by: Eric Bénard <eric@eukrea.com>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
1 parent a4dfb8d commit 50b02080c91a26fffe2997e20fb63728fb4c7f7f
@Eric Bénard Eric Bénard authored on 7 Dec 2013
Sascha Hauer committed on 12 Dec 2013
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drivers/mtd/nand/atmel_nand.c