Convert unit_base to posval[]

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/options.c b/options.c
index 6cd1e92..193bdbc 100644
--- a/options.c
+++ b/options.c
@@ -1087,19 +1087,6 @@
 	return 0;
 }
 
-static int kb_base_verify(struct fio_option *o, void *data)
-{
-	struct thread_data *td = data;
-
-	if (td->o.kb_base != 1024 && td->o.kb_base != 1000) {
-		log_err("fio: kb_base set to nonsensical value: %u\n",
-				td->o.kb_base);
-		return 1;
-	}
-
-	return 0;
-}
-
 /*
  * Map of job/command line options
  */
@@ -1143,9 +1130,18 @@
 		.name	= "kb_base",
 		.type	= FIO_OPT_INT,
 		.off1	= td_var_offset(kb_base),
-		.verify	= kb_base_verify,
 		.prio	= 1,
 		.def	= "1024",
+		.posval = {
+			  { .ival = "1024",
+			    .oval = 1024,
+			    .help = "Use 1024 as the K base",
+			  },
+			  { .ival = "1000",
+			    .oval = 1000,
+			    .help = "Use 1000 as the K base",
+			  },
+		},
 		.help	= "How many bytes per KB for reporting (1000 or 1024)",
 	},
 	{