tidy: Remove redundant calls to a smart pointer's get method.

Clang-tidy pointed out where functions explicitly call the smart
pointer get() method where an implicit call can happen.  Changes made
by the clang-tidy program.

These problems were pointed out by clang-tidy's "redundant smart
pointer get" check.

https://clang.llvm.org/extra/clang-tidy/checks/readability-redundant-smartptr-get.html

mythplugins/mythmusic/mythmusic/cdrip.cpp

@@ -339,7 +339,7 @@ void CDRipperThread::run(void)
                 }
             }
 
-            if (!encoder.get())
+            if (!encoder)
             {
                 // This should never happen.
                 QApplication::postEvent(