Revert "Input: do not pass injected events back to the originating handler"

Revert "Input: do not pass injected events back to the originating handler"

This reverts commit 3fd912b86c2ba7dac0750c0f9b3a3f0864553c8e.

Apparently there exist userspace programs that expect to be able to
"loop back" and distribute to readers events written into
/dev/input/eventX and this change made for the benefit of SysRq
handler broke them. Now that SysRq uses alternative method to suppress
filtering of the events it re-injects we can safely revert this change.

Reported-by: Kristen Carlson Accardi <kristen@linux.intel.com>
Cc: stable@kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>