Put variable declaration closer to use

Gets rid of a call and better defines its scope.

Change-Id: I28e6b8acb0f8b9e13cbfa049419e94072c6883a6
Signed-off-by: Patrick Georgi <pgeorgi@google.com>

src/main/java/com/googlesource/gerrit/plugins/avatars/external/ExternalUrlAvatarProvider.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/avatars/external/ExternalUrlAvatarProvider.java b/src/main/java/com/googlesource/gerrit/plugins/avatars/external/ExternalUrlAvatarProvider.java
index c4c2192..f85ca97 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/avatars/external/ExternalUrlAvatarProvider.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/avatars/external/ExternalUrlAvatarProvider.java
@@ -67,7 +67,6 @@
     if (ssl && externalAvatarUrl.startsWith("http://")) {
       externalAvatarUrl = externalAvatarUrl.replace("http://", "https://");
     }
-    StringBuilder avatarUrl = new StringBuilder();
     String userReplacedAvatarURL = fillOutTemplate(externalAvatarUrl,
         forUser);
 
@@ -81,7 +80,7 @@
       return null;
     }
 
-    avatarUrl.append(userReplacedAvatarURL);
+    StringBuilder avatarUrl = new StringBuilder(userReplacedAvatarURL);
     if (imageSize > 0 && sizeParameter != null) {
       if (avatarUrl.indexOf("?") < 0) {
         avatarUrl.append("?");