fs/9p: cleanup: opening brace at the beginning of the next line

Error found by checkpatch.pl

Link: http://lkml.kernel.org/r/20211001062454.99205-1-sohaib.amhmd@gmail.com


Signed-off-by: Sohaib Mohamed <sohaib.amhmd@gmail.com>
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>