certain bmp files' dimensions are miscalculated

[labaneilers]

/assets/favicons/favicon1.bmp is incorrect on both unix and windows. Check out the height:
{
"path": "/favicons/favicon1.bmp",
"hashedPath": "/favicons/favicon1-hced2f9fa827b490a4621729afb8533060.bmp",
"width": 360,
"height": 4294967010
},

It should be 270. Looks like a bug in image-size.