CHROMIUM: drm/exynos: fix leak in exynos_drm_framebuffer_init

CHROMIUM: drm/exynos: fix leak in exynos_drm_framebuffer_init

There was a leak in one of the error paths.

BUG=chrome-os-partner:15349,chrome-os-partner:14965
TEST=VT Switch. Browse some sites.

Change-Id: Iddb946c43c8b25ef3b66e3c5e9c73b5e564bb334
Signed-off-by: Mandeep Singh Baines <msb@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/38892
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>