bvec: fix the include guards for bvec.h

Fix the include guards to match the file naming.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Link: https://lore.kernel.org/r/20210727055646.118787-3-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

include/linux/bvec.h

@@ -4,8 +4,8 @@
  *
  * Copyright (C) 2001 Ming Lei <ming.lei@canonical.com>
  */
-#ifndef __LINUX_BVEC_ITER_H
-#define __LINUX_BVEC_ITER_H
+#ifndef __LINUX_BVEC_H
+#define __LINUX_BVEC_H
 
 #include <linux/bug.h>
 #include <linux/errno.h>
@@ -183,4 +183,4 @@ static inline void bvec_advance(const struct bio_vec *bvec,
 	}
 }
 
-#endif /* __LINUX_BVEC_ITER_H */
+#endif /* __LINUX_BVEC_H */