pwmsensor: drop unnecessary return

[src/PwmSensor.cpp:133]: (style) Consecutive return, break, continue,
goto or throw statements are unnecessary.

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I115285c10a8e38f19c300edab789223da05a2fa6
diff --git a/src/PwmSensor.cpp b/src/PwmSensor.cpp
index 063c359..86a76f2 100644
--- a/src/PwmSensor.cpp
+++ b/src/PwmSensor.cpp
@@ -130,7 +130,6 @@
     if (!ref.good())
     {
         throw std::runtime_error("Bad Write File");
-        return;
     }
     ref << value;
 }