[PATCH] alpha: Fix generic brk system call emulation in __brk_call (bug 29490)

[Florian Weimer]

The kernel special-cases the zero argument for alpha brk, and we can
use that to restore the generic Linux error handling behavior.

This change fixes an ldconfig crash under qemu-user for me.

---
 sysdeps/unix/sysv/linux/alpha/brk_call.h | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/sysdeps/unix/sysv/linux/alpha/brk_call.h b/sysdeps/unix/sysv/linux/alpha/brk_call.h
index b8088cf13f..0b851b6c86 100644
--- a/sysdeps/unix/sysv/linux/alpha/brk_call.h
+++ b/sysdeps/unix/sysv/linux/alpha/brk_call.h
@@ -21,8 +21,7 @@ __brk_call (void *addr)
 {
   unsigned long int result = INTERNAL_SYSCALL_CALL (brk, addr);
   if (result == -ENOMEM)
-    /* Mimic the default error reporting behavior.  */
-    return addr;
-  else
-    return (void *) result;
+    /* Mimic the generic error reporting behavior.  */
+    result = INTERNAL_SYSCALL_CALL (brk, 0);
+  return (void *) result;
 }