[PATCH] examples/dma: fix max-frame-size cannot be zero

[Chengwen Feng]

In the original implementation, the max_frame_size could be zero, but
commit ("examples/dma: replace getopt with argparse") treat zero as an
error. This commit fixes it.

Also, since unsigned doesn't < 0, adjust "<= 0" judgement to "== 0".

Fixes: 8d85afb19af7 ("examples/dma: replace getopt with argparse")

Reported-by: Jiang, YuX <yux.ji...@intel.com>
Signed-off-by: Chengwen Feng <fengcheng...@huawei.com>
---
 examples/dma/dmafwd.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/examples/dma/dmafwd.c b/examples/dma/dmafwd.c
index f4a0bff06e..acceae6b7b 100644
--- a/examples/dma/dmafwd.c
+++ b/examples/dma/dmafwd.c
@@ -695,23 +695,23 @@ dma_parse_args(int argc, char **argv, unsigned int 
nb_ports)
                return ret;
 
        /* check argument's value which parsing by autosave. */
-       if (dma_batch_sz <= 0 || dma_batch_sz > MAX_PKT_BURST) {
+       if (dma_batch_sz == 0 || dma_batch_sz > MAX_PKT_BURST) {
                printf("Invalid dma batch size, %d.\n", dma_batch_sz);
                return -1;
        }
 
-       if (max_frame_size <= 0 || max_frame_size > 
RTE_ETHER_MAX_JUMBO_FRAME_LEN) {
+       if (max_frame_size > RTE_ETHER_MAX_JUMBO_FRAME_LEN) {
                printf("Invalid max frame size, %d.\n", max_frame_size);
                return -1;
        }
 
-       if (nb_queues <= 0 || nb_queues > MAX_RX_QUEUES_COUNT) {
+       if (nb_queues == 0 || nb_queues > MAX_RX_QUEUES_COUNT) {
                printf("Invalid RX queues number %d. Max %u\n",
                        nb_queues, MAX_RX_QUEUES_COUNT);
                return -1;
        }
 
-       if (ring_size <= 0) {
+       if (ring_size == 0) {
                printf("Invalid ring size, %d.\n", ring_size);
                return -1;
        }
@@ -721,7 +721,7 @@ dma_parse_args(int argc, char **argv, unsigned int nb_ports)
                ring_size = MBUF_RING_SIZE;
        }
 
-       if (stats_interval <= 0) {
+       if (stats_interval == 0) {
                printf("Invalid stats interval, setting to 1\n");
                stats_interval = 1;     /* set to default */
        }
-- 
2.17.1