Fix KeyVal.inputStream validation

Author: jhy

src/main/java/org/jsoup/helper/HttpConnection.java

@@ -1434,7 +1434,7 @@ public String value() {
 
         @Override
         public KeyVal inputStream(InputStream inputStream) {
-            Validate.notNullParam(value, "inputStream");
+            Validate.notNullParam(inputStream, "inputStream");
             this.stream = inputStream;
             return this;
         }

src/test/java/org/jsoup/helper/HttpConnectionTest.java

@@ -291,6 +291,8 @@ public void caseInsensitiveHeaders(Locale locale) {
         assertEquals("file", kv.key());
         assertEquals("thumb.jpg", kv.value());
         assertTrue(kv.hasInputStream());
+        assertThrows(ValidationException.class, () ->
+            HttpConnection.KeyVal.create("file", "thumb.jpg").inputStream(null));
 
         kv = HttpConnection.KeyVal.create("one", "two");
         assertEquals("one", kv.key());