dmaengine: ste_dma40: Rectify incorrect configuration validation checking

If we compare an event's group (dev_type / 16) with STEDMA40_DEV_DST_MEMORY
(-1), the only way we'd obtain a positive result is if we passed -16 as a
device type, which is unfeasible. Instead, it would be much more sane to
compare STEDMA40_DEV_DST_MEMORY against the raw dev_type in order to expect
the expected result.

Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/dma/ste_dma40.c

@@ -1785,19 +1785,19 @@ static int d40_validate_conf(struct d40_chan *d40c,
 	}
 
 	if (conf->dir == STEDMA40_MEM_TO_PERIPH &&
-	    dst_event_group == STEDMA40_DEV_DST_MEMORY) {
+	    conf->dst_dev_type == STEDMA40_DEV_DST_MEMORY) {
 		chan_err(d40c, "Invalid dst\n");
 		res = -EINVAL;
 	}
 
 	if (conf->dir == STEDMA40_PERIPH_TO_MEM &&
-	    src_event_group == STEDMA40_DEV_SRC_MEMORY) {
+	    conf->src_dev_type == STEDMA40_DEV_SRC_MEMORY) {
 		chan_err(d40c, "Invalid src\n");
 		res = -EINVAL;
 	}
 
-	if (src_event_group == STEDMA40_DEV_SRC_MEMORY &&
-	    dst_event_group == STEDMA40_DEV_DST_MEMORY && is_log) {
+	if (conf->src_dev_type == STEDMA40_DEV_SRC_MEMORY &&
+	    conf->dst_dev_type == STEDMA40_DEV_DST_MEMORY && is_log) {
 		chan_err(d40c, "No event line\n");
 		res = -EINVAL;
 	}