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The ops->read and ops->write existence was checked with 0, change it to NULL. This corrects sparse issues: drivers/io/io_block.c:272:9: warning: Using plain integer as NULL pointer drivers/io/io_block.c:384:9: warning: Using plain integer as NULL pointer drivers/io/io_block.c:384:9: warning: Using plain integer as NULL pointer Signed-off-by: Yann Gautier <yann.gautier@st.com> Change-Id: I039050a645107523d8263ddf820e539c260d956c