server: fix missing comma in fio_server_ops[] strings

Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/server.c b/server.c
index 2fa51df..ab3bece 100644
--- a/server.c
+++ b/server.c
@@ -68,7 +68,7 @@
 	"DISK_UTIL",
 	"SERVER_START",
 	"ADD_JOB",
-	"CMD_RUN"
+	"CMD_RUN",
 	"CMD_IOLOG",
 };