[MLIR] Apply clang-tidy fixes for llvm-else-after-return in TosaCanonicalizations.cpp (NFC)

Author: joker-eph

mlir/lib/Dialect/Tosa/IR/TosaCanonicalizations.cpp

@@ -122,8 +122,9 @@ struct PoolPadFoldAdaptor<tosa::MaxPool2dOp> {
       const APFloat lowestVal =
           APFloat::getLargest(padConstVal.getSemantics(), true);
       return padConstVal == lowestVal;
-    } else if (auto padConstIntAttr =
-                   mlir::dyn_cast<DenseIntElementsAttr>(padConstAttr)) {
+    }
+    if (auto padConstIntAttr =
+            mlir::dyn_cast<DenseIntElementsAttr>(padConstAttr)) {
       const APInt padConstVal = *padConstIntAttr.begin();
       const unsigned int bitWidth = padConstVal.getBitWidth();
       const APInt lowestVal =