Fix compile errors on ia64 in dagetcapacity.  Set block_len and maxsector to 0 initially.  It seems that the ia64 backend isn't as "smart" as the i386 backend, which realized that those variables were only set or used when error == 0, and thus were not used uninitialized.
Fix compile errors on ia64 in dagetcapacity.  Set block_len and maxsector
to 0 initially.  It seems that the ia64 backend isn't as "smart" as the
i386 backend, which realized that those variables were only set or used
when error == 0, and thus were not used uninitialized.

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