init: kill unused mlock_size

Signed-off-by: Jens Axboe <axboe@kernel.dk>

init.c

diff --git a/init.c b/init.c
index 8c80298..634dda2 100644
--- a/init.c
+++ b/init.c
@@ -45,7 +45,6 @@
 int output_format = FIO_OUTPUT_NORMAL;
 int eta_print = FIO_ETA_AUTO;
 int eta_new_line = 0;
-unsigned long long mlock_size = 0;
 FILE *f_out = NULL;
 FILE *f_err = NULL;
 char **job_sections = NULL;