DLPX-72754 [Backport of DLPX-72753 to 6.0.6.0] initramfs: zfsunlock h…

…ook breaks /usr/bin (openzfs#231)

The copy_exec() function expects that the full path of the target
file is passed rather than just the directory, and will take care
of creating the underlying directories if they don't exist.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Pavel Zakharov <pavel.zakharov@delphix.com>
Closes openzfs#11162

contrib/initramfs/hooks/zfsunlock.in

@@ -15,4 +15,4 @@ esac
 
 . /usr/share/initramfs-tools/hook-functions
 
-copy_exec /usr/share/initramfs-tools/zfsunlock /usr/bin
+copy_exec /usr/share/initramfs-tools/zfsunlock /usr/bin/zfsunlock