Be more careful about overwriting device.originalFormat. (#1192004)
Be more careful about overwriting device.originalFormat. (#1192004)

We don't want to overwrite it if addUdevDevice was called a second time
for a device we've already added, since that would cause us to lose the
real original format.

vpodzime/blivet,dwlehman/blivet,jkonecny12/blivet,vpodzime/blivet,rvykydal/blivet,vojtechtrefny/blivet,rhinstaller/blivet,jkonecny12/blivet,rvykydal/blivet,dwlehman/blivet,AdamWill/blivet,AdamWill/blivet,vojtechtrefny/blivet,rhinstaller/blivet