Add back missing return to non-void function

It was incorrectly removed accidentally in e4e463e.

Author: joker-eph

mlir/lib/Conversion/TosaToLinalg/TosaToLinalg.cpp

@@ -1665,6 +1665,7 @@ class ResizeConverter : public OpRewritePattern<tosa::ResizeOp> {
       rewriter.create<linalg::YieldOp>(loc, result);
       return success();
     }
+    return failure();
   }
 };