ffz() takes ints, so change the file_map to being int based

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/fio.h b/fio.h
index 0d3ed4a..a155518 100644
--- a/fio.h
+++ b/fio.h
@@ -326,7 +326,7 @@
 	/*
 	 * block map for random io
 	 */
-	unsigned long *file_map;
+	unsigned int *file_map;
 	unsigned int num_maps;
 	unsigned int last_free_lookup;
 
@@ -704,7 +704,7 @@
 	assert(!(io_u->ddir == DDIR_WRITE && !td_write(td)));
 }
 
-#define BLOCKS_PER_MAP		(8 * sizeof(long))
+#define BLOCKS_PER_MAP		(8 * sizeof(int))
 #define TO_MAP_BLOCK(f, b)	(b)
 #define RAND_MAP_IDX(f, b)	(TO_MAP_BLOCK(f, b) / BLOCKS_PER_MAP)
 #define RAND_MAP_BIT(f, b)	(TO_MAP_BLOCK(f, b) & (BLOCKS_PER_MAP - 1))