qemu-io: fix cvtnum lval types
cvtnum() returns int64_t: we should not be storing this result inside of an int. In a few cases, we need an extra sprinkling of error handling where we expect to pass this number on towards a function that expects something smaller than int64_t. Reported-by: NMax Reitz <mreitz@redhat.com> Signed-off-by: NJohn Snow <jsnow@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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