[fix] convert IOException to Ruby exception correctly

follow up on: a011807 (#242)

Author: kares

src/main/java/org/jruby/ext/openssl/SSLSocket.java

@@ -867,7 +867,7 @@ private IRubyObject sysreadImpl(final ThreadContext context, final IRubyObject l
         }
         catch (IOException ex) {
             debugStackTrace(runtime, "SSLSocket.sysreadImpl", ex);
-            throw Utils.newError(runtime, runtime.getIOError(), ex);
+            throw Utils.newError(runtime::newIOErrorFromException, ex);
         }
     }
 
@@ -951,7 +951,7 @@ private IRubyObject syswriteImpl(final ThreadContext context,
         }
         catch (IOException ex) {
             debugStackTrace(runtime, "SSLSocket.syswriteImpl", ex);
-            throw runtime.newIOErrorFromException(ex);
+            throw Utils.newError(runtime::newIOErrorFromException, ex);
         }
     }
 

src/main/java/org/jruby/ext/openssl/Utils.java

@@ -30,6 +30,7 @@
 import java.io.IOException;
 import java.nio.ByteBuffer;
 import java.util.HashSet;
+import java.util.function.Function;
 
 import org.jruby.*;
 import org.jruby.exceptions.RaiseException;
@@ -94,6 +95,12 @@ static RaiseException newError(Ruby runtime, RubyClass errorClass, String msg, T
         return ex;
     }
 
+    static <T extends Throwable> RaiseException newError(Function<T, RaiseException> errorFunction, T e) {
+        RaiseException ex = errorFunction.apply(e);
+        ex.initCause(e);
+        return ex;
+    }
+
     // reinvented parts of org.jruby.runtime.Helpers for compatibility with "older" JRuby :
 
     static IRubyObject invoke(ThreadContext context, IRubyObject self, String name, Block block) {