comedi: ni_*: do not declare unused variable range_ni_E_ao_ext

Mirsad Todorovac reported a compiler warning in "ni_stc.h" due to the
variable `range_ni_E_ao_ext` being defined but unused when building the
"ni_routes_test" module.

The `range_ni_E_ao_ext` variable is tentatively defined in "ni_stc.h"
(with internal linkage) and fully defined in "ni_mio_common.c".
"ni_stc.h" and/or "ni_mio_common.c" are included by the "ni_atmio",
"ni_pcimio", "ni_mio_cs", and "ni_routes_test" modules, which will each
get their own local `range_ni_E_ao_ext` variable defined.  However, it
is not used by the "ni_mio_cs" or "ni_routes_test" modules.  They should
get optimized out, but there are compiler warnings about the unused
variable when built with the `W=1` option.

Move the full definition of the variable from "ni_mio_common.c" into the
places where it is used, namely "ni_atmio.c" and "ni_pcimio.c", and
remove the tentative definition of the variable from "ni_stc.h".  This
fixes the compiler warnings.

Reported-by: Mirsad Todorovac <[email protected]>
Link: https://lore.kernel.org/lkml/[email protected]/
Cc: Mirsad Todorovac <[email protected]>
Signed-off-by: Ian Abbott <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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