Cope with arch-specific page protection flags in mmap (Richard Purdie).

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4250 c046a42c-6fe2-441c-8c8c-71466251a162

linux-user/mmap.c

@@ -49,8 +49,7 @@ int target_mprotect(abi_ulong start, abi_ulong len, int prot)
     end = start + len;
     if (end < start)
         return -EINVAL;
-    if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC))
-        return -EINVAL;
+    prot &= PROT_READ | PROT_WRITE | PROT_EXEC;
     if (len == 0)
         return 0;