parasite: typo fix for double pointer on mask of blocked signals

PTRACE_SETSIGMASK takes pointer on mask of blocked signals,
but sigmask is already pointer.
Signed-off-by: Andrew Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

parasite-syscall.c

@@ -137,7 +137,7 @@ err:
 		ret = -1;
 	}
 err_sigmask:
-	if (ptrace(PTRACE_SETSIGMASK, pid, sizeof(k_rtsigset_t), &sigmask)) {
+	if (ptrace(PTRACE_SETSIGMASK, pid, sizeof(k_rtsigset_t), sigmask)) {
 		pr_perror("Can't block signals");
 		ret = -1;
 	}