[PATCH i-g-t] tests/kms_display_modes: Add check for ≥2 outputs in extended mode test

[Jeevan B]

extended mode test needs minimum 2 display to run, so add igt_require
to check if the required criteria is met or not.

v2: Fix commit message.
v3: Update subject.

Signed-off-by: Jeevan B <jeevan.b at intel.com>
---
 tests/kms_display_modes.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tests/kms_display_modes.c b/tests/kms_display_modes.c
index e41c60cc0..117f82325 100644
--- a/tests/kms_display_modes.c
+++ b/tests/kms_display_modes.c
@@ -335,8 +335,10 @@ igt_main
 	}
 
 	igt_describe("Test for validating display extended mode with a pair of connected displays");
-	igt_subtest_with_dynamic("extended-mode-basic")
+	igt_subtest_with_dynamic("extended-mode-basic") {
+		igt_require_f(count > 1, "Minimum 2 outputs are required\n");
 		run_extendedmode_test(&data);
+	}
 
 	igt_describe("Negative test for validating display extended mode with a pair of connected "
 		     "2k-4k or 4k-4k displays");
-- 
2.25.1