client: fix shadowing in inode ctor

client: fix shadowing in inode ctor

CID 728080 (#1 of 1): Incorrect sizeof expression (BAD_SIZEOF)
Taking the size of pointer parameter "layout" is suspicious.

At (2): Non-static class member field "layout.fl_stripe_unit" is not initialized in this constructor nor in any functions that it calls.
At (4): Non-static class member field "layout.fl_stripe_count" is not initialized in this constructor nor in any functions that it calls.
At (6): Non-static class member field "layout.fl_object_size" is not initialized in this constructor nor in any functions that it calls.
At (8): Non-static class member field "layout.fl_cas_hash" is not initialized in this constructor nor in any functions that it calls.
At (10): Non-static class member field "layout.fl_object_stripe_unit" is not initialized in this constructor nor in any functions that it calls.
At (12): Non-static class member field "layout.fl_unused" is not initialized in this constructor nor in any functions that it calls.
CID 717206 (#1 of 1): Uninitialized scalar field (UNINIT_CTOR)
At (14): Non-static class member field "layout.fl_pg_pool" is not initialized in this constructor nor in any functions that it calls.

Signed-off-by: Sage Weil <sage@inktank.com>