arm64/ptrace: Clean up error handling path in sve_set_common()

All error handling paths go to 'out', except this one. Be consistent and
also branch to 'out' here.

Fixes: e12310a0 ("arm64/sme: Implement ptrace support for streaming mode SVE registers")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Link: https://lore.kernel.org/r/aa61301ed2dfd079b74b37f7fede5f179ac3087a.1689616473.git.christophe.jaillet@wanadoo.fr


Signed-off-by: Will Deacon <will@kernel.org>