Fix grammatical typo in a comment.
diff --git a/Modules/_localemodule.c b/Modules/_localemodule.c
index de470e0..bd57c2f 100644
--- a/Modules/_localemodule.c
+++ b/Modules/_localemodule.c
@@ -426,7 +426,7 @@
     /* XXX which one is mac-latin2? */
     }
     if (!name) {
-        /* This leaks a an object. */
+        /* This leaks an object. */
         name = CFStringConvertEncodingToIANACharSetName(enc);
     }
     return (char *)CFStringGetCStringPtr(name, 0);