shmc bug fixes

[Stefan Fritsch]

Hi,

attached are some fixes for shmc:

- fix various capability slot leaks in error paths
- if l4re_ns_register_obj_srv() fails, return its error code to the caller and 
don't invent another one
- use memory barriers in l4shmc_add_chunk() because l4shmc_get_chunk_to() 
walks the linked list without acquiring the lock
- fix l4shmc_add_signal() freeing one of env's capabilities in an error path

Cheers,
Stefan
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