fbmon: prevent division by zero in fb_videomode_from_videomode()

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                        "drivers/video/fbdev/core/fbmon.c"
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                    "programFiles": [
                        "drivers/video/fbdev/core/fbmon.c"
                    ],
                    "versions": [
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                            "version": "3.9",
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                            "version": "0",
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                            "versionType": "original_commit_for_fix"
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                }