K 10
svn:author
V 3
jhb
K 8
svn:date
V 27
2019-07-15T21:25:16.772227Z
K 7
svn:log
V 401
Don't pass error from syscallenter() to syscallret().

syscallret() doesn't use error anymore.  Fix a few other places to permit
removing the return value from syscallenter() entirely.
- Remove a duplicated assertion from arm's syscall().
- Use td_errno for amd64_syscall_ret_flush_l1d.

Reviewed by:	kib
MFC after:	1 month
Sponsored by:	DARPA
Differential Revision:	https://reviews.freebsd.org/D2090

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