Backup errno in net_would_block
Safe and restore the value of errno in net_would_block to be sure
it's not affected by the guarding call to fcntl. Fixes #845.
diff --git a/ChangeLog b/ChangeLog
index 13de867..202262b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,11 @@
mbed TLS ChangeLog (Sorted per branch, date)
+= mbed TLS x.x.x branch released xxxx-xx-xx
+
+Bugfix
+ * Fix net_would_block to avoid modification by errno through fcntl call.
+ Found by nkolban. Fixes #845.
+
= mbed TLS 2.4.2 branch released 2017-03-08
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