fix hugepage-size type mismatch

hugepage_size in thread_options is of type int, but listed in
options.c as type long.  This patch reconciles the two.

Signed-off-by: Aaron Carroll <aaronc@gelato.unsw.edu.au>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/options.c b/options.c
index b59dd22..1119a98 100644
--- a/options.c
+++ b/options.c
@@ -1118,7 +1118,7 @@
 	},
 	{
 		.name	= "hugepage-size",
-		.type	= FIO_OPT_STR_VAL,
+		.type	= FIO_OPT_STR_VAL_INT,
 		.off1	= td_var_offset(hugepage_size),
 		.help	= "When using hugepages, specify size of each page",
 		.def	= __stringify(FIO_HUGE_PAGE),