disp: msm: dsi: fix illegal memory access

The priv_info for dsi_display_mode is assigned to NULL after use, so
that it cannot be outside the dsi_find_mode function.

Change-Id: Ifacd1f1ea4edab1e6659b42522c5f216676a9a01
Signed-off-by: Satya Rama Aditya Pinapala <psraditya30@codeaurora.org>

msm/dsi/dsi_display.c

@@ -7197,6 +7197,9 @@ int dsi_display_find_mode(struct dsi_display *display,
 			break;
 		}
 	}
+
+	cmp->priv_info = NULL;
+
 	mutex_unlock(&display->display_lock);
 
 	if (!*out_mode) {