drm/exynos/vidi: fix memory leak in .get_modes()

mainline inclusion
from mainline-v6.10-rc4
commit 38e3825631b1f314b21e3ade00b5a4d737eb054e
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/IACV3A
CVE: CVE-2024-40932

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=38e3825631b1f314b21e3ade00b5a4d737eb054e



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The duplicated EDID is never freed. Fix it.

Cc: stable@vger.kernel.org
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: liwei <liwei728@huawei.com>