a small set of other FindBugs warnings cleanup; no actual issues found, 97 false warnings remain
diff --git a/src/main/java/com/fasterxml/jackson/core/JsonFactory.java b/src/main/java/com/fasterxml/jackson/core/JsonFactory.java
index 1301e6d..40a9836 100644
--- a/src/main/java/com/fasterxml/jackson/core/JsonFactory.java
+++ b/src/main/java/com/fasterxml/jackson/core/JsonFactory.java
@@ -1327,7 +1327,7 @@
         // 13-May-2016, tatu: Need to take care not to accidentally create JSON parser for
         //   non-JSON input. So, bit unclean but...
         String format = getFormatName();
-        if (format != FORMAT_NAME_JSON) {
+        if (format != FORMAT_NAME_JSON) { // NOTE: only ensure override; full equality NOT needed
             throw new UnsupportedOperationException(String.format(
                     "InputData source not (yet?) support for this format (%s)", format));
         }