tests/kms_addfb_basic: avoid excessive logging on legacy format test

legacy format addfb test try to fuzz kernel with random parameters,
these random parameters cause logging into dmesg. Limit fuzzing
rounds to maximum of 10k (or 1 second) to limit size of created log.

Fixes: https://gitlab.freedesktop.org/drm/intel/-/issues/7017


Signed-off-by: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Reviewed-by: Vinod Govindapillai <vinod.govindapillai@intel.com>

tests/kms_addfb_basic.c

@@ -241,6 +241,13 @@ static void invalid_tests(int fd)
 			}
 
 			count++;
+
+			/*
+			 * to avoid exessive logging stop after 10k loops
+			 */
+			if (count >= 10000) {
+				break;
+			}
 		}
 
 		/* After all the abuse, confirm the known_formats */