drivers: video: common: optimization in for exact matches

In video_closest_frmival(), immediately stop searching when an exact
match is found, as a small performance optimization.

Signed-off-by: Josuah Demangeon <me@josuah.net>

Author: josuah

drivers/video/video_common.c

@@ -153,10 +153,16 @@ void video_closest_frmival(const struct device *dev, enum video_endpoint_id ep,
 		a = video_frmival_nsec(&desired);
 		b = video_frmival_nsec(&tmp);
 		diff_nsec = a > b ? a - b : b - a;
+
 		if (diff_nsec < best_diff_nsec) {
 			best_diff_nsec = diff_nsec;
 			match->index = fie.index;
 			memcpy(&match->discrete, &tmp, sizeof(tmp));
 		}
+
+		if (diff_nsec == 0) {
+			/* Exact match, stop searching a better match */
+			break;
+		}
 	}
 }