The err variable is not being reset after a successful read. Explicitly
return 0 at the end of function call to account for all return paths.
Reported-by: NJens-Peter Oswald <oswald@lre.de>
Signed-off-by: NAkshay Bhat <akshay.bhat@timesys.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>