Close the unused pipe file descriptors so the parent will notice if
the child exits prematurely. Previously, the parent would block
forever on a read from the pipe.
$ uefisign -c foo.cert -k foo.key -o loader.efi loader.efi.unsigned uefisign: section points inside the headers load: 0.06 cmd: uefisign 4502 [piperd] 7.25r 0.00u 0.00s 0% 5968k ... _sleep+0x1be pipe_read+0x3d6 kern_readv+0x8c sys_read+0x83 ...
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MFC after: 1 week