Fix mips __fadvise64.S build failure.

Bug: 12449798
Change-Id: I0663b741108ba2f1d286904d6414b3ff4d475551
diff --git a/libc/arch-mips/syscalls/__fadvise64.S b/libc/arch-mips/syscalls/__fadvise64.S
index 6d494a1..abacbb2 100644
--- a/libc/arch-mips/syscalls/__fadvise64.S
+++ b/libc/arch-mips/syscalls/__fadvise64.S
@@ -5,7 +5,7 @@
 ENTRY(__fadvise64)
     .set noreorder
     .cpload t9
-    li v0, __NR_fadvise64_64
+    li v0, __NR_fadvise64
     syscall
     bnez a3, 1f
     move a0, v0