[Toybox] [PATCH] mount: chomp() trailing '\n' off xrunread() return value

[Yi-yo Chiang]

losetup -sf prints trailing newline, which confuses the mount command:

  mount /mnt/test.img /mnt/mntpoint
  > mount: '/dev/block/loop48
  > '->'/mnt/test': No such file or directory

Bug: 243494992
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