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iio: scd4x: check return of scd4x_write_and_fetch
commit f502321 upstream. Clang static analysis reports this problem scd4x.c:474:10: warning: The left operand of '==' is a garbage value if (val == 0xff) { ~~~ ^ val is only set from a successful call to scd4x_write_and_fetch() So check it's return. Fixes: 49d22b6 ("drivers: iio: chemical: Add support for Sensirion SCD4x CO2 sensor") Signed-off-by: Tom Rix <trix@redhat.com> Link: https://lore.kernel.org/r/20220301025223.223223-1-trix@redhat.com Cc: <Stable@vger.kernel.org> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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