-Wsometimes-uninitialized in drivers/md/dm-dust.c

[nathanchance]

drivers/md/dm-dust.c:216:11: warning: variable 'ret' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
        else if (bio_data_dir(bio) == WRITE)
                 ^~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/bio.h:69:2: note: expanded from macro 'bio_data_dir'
        (op_is_write(bio_op(bio)) ? WRITE : READ)
        ^
drivers/md/dm-dust.c:219:9: note: uninitialized use occurs here
        return ret;
               ^~~
drivers/md/dm-dust.c:216:7: note: remove the 'if' if its condition is always true
        else if (bio_data_dir(bio) == WRITE)
             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/md/dm-dust.c:209:9: note: initialize the variable 'ret' to silence this warning
        int ret;
               ^
                = 0
1 warning generated.

Patch sent: https://lore.kernel.org/lkml/20190430021010.25151-1-natechancellor@gmail.com/

[nathanchance]

My submitted commit was squashed into the original driver commit, this is fixed on next-20190501.