pmagb-b-fb: improve diagnostics
Add error messages to the probe call. [adaplas] On failure, return actual error value instead of -ENXIO. Signed-off-by: NMaciej W. Rozycki <macro@linux-mips.org> Signed-off-by: NAntonino Daplas <adaplas@gmail.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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