Linux 5.16 compat: submit_bio()

The submit_bio() prototype has changed again.  The version is 5.16
still only expects a single argument but the return type has changed
to void.  Since we never used the returned value before update the
configure check to detect both single arg versions.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Alexander Lobakin <alobakin@pm.me>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #12725

config/kernel-bio.m4

@@ -294,9 +294,8 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_BIO_SUBMIT_BIO], [
 	ZFS_LINUX_TEST_SRC([submit_bio], [
 		#include <linux/bio.h>
 	],[
-		blk_qc_t blk_qc;
 		struct bio *bio = NULL;
-		blk_qc = submit_bio(bio);
+		(void) submit_bio(bio);
 	])
 ])
 

module/os/linux/zfs/vdev_disk.c

@@ -433,9 +433,9 @@ static inline void
 vdev_submit_bio_impl(struct bio *bio)
 {
 #ifdef HAVE_1ARG_SUBMIT_BIO
-	submit_bio(bio);
+	(void) submit_bio(bio);
 #else
-	submit_bio(0, bio);
+	(void) submit_bio(0, bio);
 #endif
 }