building with gcc and W=1 reports
drivers/net/xen-netback/netback.c:886:21: error: variable
‘pending_idx’ set but not used [-Werror=unused-but-set-variable]
886 | u16 pending_idx;
| ^~~~~~~~~~~
pending_idx is not used so remove it. Since index was only
used to set pending_idx, remove index as well.
Signed-off-by: Tom Rix <trix@xxxxxxxxxx>
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