re PR other/67457 (segfault in libbacktrace)

	PR other/67457
	* mmap.c (backtrace_alloc): Correct test for mmap failure.

From-SVN: r227529

libbacktrace/ChangeLog

+2015-09-08  Ian Lance Taylor  <iant@google.com>
+
+	PR other/67457
+	* mmap.c (backtrace_alloc): Correct test for mmap failure.
+
 2015-08-31  Ulrich Weigand  <Ulrich.Weigand@de.ibm.com>
 
 	* configure.ac: For spu-*-* targets, set have_fcntl to no.

libbacktrace/mmap.c

@@ -139,7 +139,7 @@ backtrace_alloc (struct backtrace_state *state,
       asksize = (size + pagesize - 1) & ~ (pagesize - 1);
       page = mmap (NULL, asksize, PROT_READ | PROT_WRITE,
 		   MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
-      if (page == NULL)
+      if (page == MAP_FAILED)
 	error_callback (data, "mmap", errno);
       else
 	{