tools/xen-mfndump: Remove stray semicolon preventing 'dump-m2p' from functioning

tools/xen-mfndump: Remove stray semicolon preventing 'dump-m2p' from functioning

Introduced by c/s 1781f00e

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Coverity-IDs: 1291939 (stray semicolon), 1291941 (structually dead code)
CC: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
CC: Ian Campbell <Ian.Campbell@citrix.com>
CC: Ian Jackson <Ian.Jackson@eu.citrix.com>
CC: Wei Liu <wei.liu2@citrix.com>
CC: Xen Coverity Team <coverity@xen.org>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>