Simplify conditional.

Author: rlazo

ci/danger/Dangerfile

@@ -76,10 +76,8 @@ end
 # Warn if a changelog is left out on a non-trivial PR that has modified
 # SDK source files.
 #
-if has_sdk_changes()
-  if !has_changelog_changes && !declared_trivial
-    warning = "Did you forget to add a changelog entry? (Add the 'no-changelog'"\
-      " label to the PR to silence this warning.)"
-    warn(warning)
-  end
+if has_sdk_changes() && !has_changelog_changes && !declared_trivial
+  warning = "Did you forget to add a changelog entry? (Add the 'no-changelog'"\
+            " label to the PR to silence this warning.)"
+  warn(warning)
 end