block/rnbd-srv: remove unused header

No need to include it since none of macros in limits.h are
used by rnbd-srv.
Acked-by: Jack Wang <jinpu.wang@ionos.com>
Signed-off-by: Guoqing Jiang <guoqing.jiang@linux.dev>
Link: https://lore.kernel.org/r/20230524070026.2932-3-guoqing.jiang@linux.devSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/rnbd/rnbd-srv-sysfs.c

@@ -9,7 +9,6 @@
 #undef pr_fmt
 #define pr_fmt(fmt) KBUILD_MODNAME " L" __stringify(__LINE__) ": " fmt
 
-#include <uapi/linux/limits.h>
 #include <linux/kobject.h>
 #include <linux/sysfs.h>
 #include <linux/stat.h>