Typo in Linux device enumeration

[gplwhite]

Hello,

I think there are a couple of mistakes in the enumeration of devices on Linux. There appear to be two places where each DefactoryStandardResolution frame width is incorrectly compared to the enumerated frame max_height - instead of the frame max_width.

FlashCap/FlashCap.Core/Devices/V4L2Devices.cs

Line 66 in 854186a

r.Width <= stepwise.max_height &&

and

FlashCap/FlashCap.Core/Devices/V4L2Devices.cs

Line 80 in 854186a

r.Width <= stepwise.max_height &&

[gplwhite]

I think there is a second issue with the filtering of the DefactoStandardResolutions.

The following lines don't seem to take operator precedence into account correctly. The modulo division has a higher order of precedence than the subtraction meaning it will happen before the subtraction. I think there should be parenthesis around the subtraction to ensure it occurs before the modulo division.

FlashCap/FlashCap.Core/Devices/V4L2Devices.cs

Line 67 in 854186a

(r.Width - stepwise.min_width % stepwise.step_width) == 0 &&

and

FlashCap/FlashCap.Core/Devices/V4L2Devices.cs

Line 70 in 854186a

(r.Height - stepwise.min_height % stepwise.step_height) == 0).

Currently I believe this will result in no characteristics being returned for devices that report a Stepwise frame size capability

(specifically this issue along with #127 seems to be stopping my Raspberry PI onboard camera from being enumerated successfully)

[kekyo]

@gplwhite I will review it in a couple of days, just wait and see.

[kekyo]

Merged, thanks!