alpha: fix decoding of shmat syscall
alpha: fix decoding of shmat syscall

On alpha, shmat syscall is known as osf_shmat.

* linux/alpha/syscallent.h (osf_shmat): Fix sys_flags and sys_func.

Saruta/strace,cuviper/strace,Saruta/strace,Saruta/strace,cuviper/strace,Saruta/strace,Saruta/strace,cuviper/strace,cuviper/strace,cuviper/strace