scsi: target: sbitmap: add seq_file forward declaration

The target core runs into a warning in the linux/sbitmap.h
file in some configurations:

In file included from include/target/target_core_base.h:7,
                 from drivers/target/target_core_fabric_lib.c:41:
include/linux/sbitmap.h:331:46: error: 'struct seq_file' declared inside parameter list will not be visible outside of this definition or declaration [-Werror]
 void sbitmap_show(struct sbitmap *sb, struct seq_file *m);
                                              ^~~~~~~~

In general, headers should not depend on others being included first,
so this fixes it with a forward declaration for that struct name, but
we probably want to merge the patch through the scsi tree to help
bisection.

Fixes: 10e9cbb6b531 ("scsi: target: Convert target drivers to use sbitmap")
Signed-off-by: Arnd Bergmann <[email protected]>
Reviewed-by: Bart Van Assche <[email protected]>
Reviewed-by: Omar Sandoval <[email protected]>
Reviewed-by: Jens Axboe <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

0 files changed, 0 insertions, 0 deletions