[glibc/azanella/y2038] linux: Simplify ppoll

[Adhemerval Zanella <azanella@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=6c5e1b8148e62076f0412e05a3e9f119f3ce3f81

commit 6c5e1b8148e62076f0412e05a3e9f119f3ce3f81
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Fri Jul 10 13:33:40 2020 -0300

    linux: Simplify ppoll
    
    With arch-syscall.h it can now assumes the existance of either
    __NR_ppoll or __NR_ppoll_time64.  The 32-bit time_t support is now
    only build for !__ASSUME_TIME64_SYSCALLS.
    
    Checked on x86_64-linux-gnu and i686-linux-gnu (on 5.4 and on 4.15
    kernel).

Diff:
---
 sysdeps/unix/sysv/linux/ppoll.c | 23 +++++++++++------------
 1 file changed, 11 insertions(+), 12 deletions(-)

diff --git a/sysdeps/unix/sysv/linux/ppoll.c b/sysdeps/unix/sysv/linux/ppoll.c
index 0f15636cce..079d56b5eb 100644
--- a/sysdeps/unix/sysv/linux/ppoll.c
+++ b/sysdeps/unix/sysv/linux/ppoll.c
@@ -37,19 +37,16 @@ __ppoll64 (struct pollfd *fds, nfds_t nfds, const struct __timespec64 *timeout,
       timeout = &tval;
     }
 
-#ifdef __ASSUME_TIME64_SYSCALLS
-# ifndef __NR_ppoll_time64
-#  define __NR_ppoll_time64 __NR_ppoll
-# endif
-  return SYSCALL_CANCEL (ppoll_time64, fds, nfds, timeout, sigmask,
-			 __NSIG_BYTES);
-#else
-# ifdef __NR_ppoll_time64
+#ifndef __NR_ppoll_time64
+# define __NR_ppoll_time64 __NR_ppoll
+#endif
   int ret = SYSCALL_CANCEL (ppoll_time64, fds, nfds, timeout, sigmask,
-                            __NSIG_BYTES);
+			    __NSIG_BYTES);
+
+#ifdef __ASSUME_TIME64_SYSCALLS
   if (ret >= 0 || errno != ENOSYS)
     return ret;
-# endif
+
   struct timespec ts32;
   if (timeout)
     {
@@ -62,9 +59,11 @@ __ppoll64 (struct pollfd *fds, nfds_t nfds, const struct __timespec64 *timeout,
       ts32 = valid_timespec64_to_timespec (*timeout);
     }
 
-  return SYSCALL_CANCEL (ppoll, fds, nfds, timeout ? &ts32 : NULL, sigmask,
-                         __NSIG_BYTES);
+  ret = SYSCALL_CANCEL (ppoll, fds, nfds, timeout ? &ts32 : NULL, sigmask,
+			__NSIG_BYTES);
 #endif
+
+  return ret;
 }
 
 #if __TIMESIZE != 64