BACKPORT: arm: don't open-code ptrace_report_syscall() (part deux)

(cherry pick from commit 70b58d896b1b30e4b89d369fbeb244c0e952cf9f)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Bug: 25773781
Bug: 9674955
Change-Id: Id1b853154bd4a66196d1fca955a8917c9a5c1086
1 file changed