aarch64:get_task_regs(): use pr_perror()

As ptrace() sets errno, it makes sense to use pr_perror().
This also fixes the bug of missing '\n'.
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Acked-by: Andrew Vagin <avagin@odin.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

arch/aarch64/crtools.c

@@ -92,14 +92,14 @@ int get_task_regs(pid_t pid, user_regs_struct_t regs, CoreEntry *core)
 	iov.iov_base = &regs;
 	iov.iov_len = sizeof(user_regs_struct_t);
 	if ((ret = ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &iov))) {
-		pr_err("Failed to obtain CPU registers for %d!", pid);
+		pr_perror("Failed to obtain CPU registers for %d", pid);
 		goto err;
 	}
 
 	iov.iov_base = &fpsimd;
 	iov.iov_len = sizeof(fpsimd);
 	if ((ret = ptrace(PTRACE_GETREGSET, pid, NT_PRFPREG, &iov))) {
-		pr_err("Failed to obtain FPU registers for %d!", pid);
+		pr_perror("Failed to obtain FPU registers for %d", pid);
 		goto err;
 	}