[Compiler-rt][MSan][MIPS] Resolve gethostbyname_r_erange for MIPS

[mohit.bhakkad]

Summary

In case of MIPS, on failure gethostbyname_r sets the errno, but doesn't return it.

Tested this with x86, and should not affect any other arch too.

[samsonov]

LGTM

compiler-rt/trunk/lib/msan/tests/msan_test.cc

TEST(MemorySanitizer, gethostbyname_r_bad_host_name) {
   EXPECT_NOT_POISONED(err);
 }
 
 TEST(MemorySanitizer, gethostbyname_r_erange) {
   char buf[5];
   struct hostent he;
   struct hostent *result;
   int err;
-  int res = gethostbyname_r("localhost", &he, buf, sizeof(buf), &result, &err);
-  ASSERT_EQ(ERANGE, res);
+  gethostbyname_r("localhost", &he, buf, sizeof(buf), &result, &err);
+  ASSERT_EQ(ERANGE, errno);
   EXPECT_NOT_POISONED(err);
 }
 
 TEST(MemorySanitizer, gethostbyname2_r) {
   char buf[2000];
   struct hostent he;
   struct hostent *result;
   int err;