libswitchhw: fix error detaction on device open
open returns -1 on error, not 0
mmap returns -1 on error, not NULL
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
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open returns -1 on error, not 0
mmap returns -1 on error, not NULL
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>