mlx4: Fix mlx4_read_clock returned errno value

[ Upstream commit 50eb393 ]

mlx4_query_rt_values should return the value of errno on failure, but in
some cases where mlx4_read_clock fails, a negative EOPNOTSUPP is
returned instead.
ix mlx4_read_clock to return the correct value.

Fixes: ee7b8d0 ("mlx4: Add ibv_query_rt_values")
Signed-off-by: Shay Drory <shayd@nvidia.com>
Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
Signed-off-by: Nicolas Morey-Chaisemartin <nmoreychaisemartin@suse.com>

providers/mlx4/verbs.c

@@ -113,7 +113,7 @@ static int mlx4_read_clock(struct ibv_context *context, uint64_t *cycles)
 	struct mlx4_context *ctx = to_mctx(context);
 
 	if (!ctx->hca_core_clock)
-		return -EOPNOTSUPP;
+		return EOPNOTSUPP;
 
 	/* Handle wraparound */
 	for (i = 0; i < 2; i++) {