core: fix replace target in if instruction (#317)

jadx-core/src/main/java/jadx/core/dex/instructions/IfNode.java

@@ -68,15 +68,16 @@ public class IfNode extends GotoNode {
 
 	@Override
 	public boolean replaceTargetBlock(BlockNode origin, BlockNode replace) {
+		boolean replaced = false;
 		if (thenBlock == origin) {
 			thenBlock = replace;
-			return true;
+			replaced = true;
 		}
 		if (elseBlock == origin) {
 			elseBlock = replace;
-			return true;
+			replaced = true;
 		}
-		return false;
+		return replaced;
 	}
 
 	public BlockNode getThenBlock() {

jadx-core/src/test/java/jadx/tests/integration/switches/TestSwitchReturnFromCase2.java

+package jadx.tests.integration.switches;
+
+import jadx.core.dex.nodes.ClassNode;
+import jadx.tests.api.IntegrationTest;
+import org.junit.Test;
+
+import static jadx.tests.api.utils.JadxMatchers.containsOne;
+import static org.hamcrest.CoreMatchers.containsString;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertThat;
+import static org.junit.Assert.assertTrue;
+
+public class TestSwitchReturnFromCase2 extends IntegrationTest {
+
+	public static class TestCls {
+		public boolean test(int a) {
+			switch (a % 4) {
+				case 2:
+				case 3:
+					if (a == 2) {
+						return true;
+					}
+					return true;
+			}
+			return false;
+		}
+
+		public void check() {
+			assertTrue(test(2));
+			assertTrue(test(3));
+			assertTrue(test(15));
+			assertFalse(test(1));
+		}
+	}
+
+	@Test
+	public void test() {
+		ClassNode cls = getClassNode(TestCls.class);
+		String code = cls.getCode().toString();
+
+		assertThat(code, containsString("switch (a % 4) {"));
+	}
+}