Fix a truly terrible memory leak.

a21fa199 · George Nachman · ad470bea · a21fa199
Commit a21fa199 authored 7 years ago by George Nachman
--- a/sources/iTermMutableAttributedStringBuilder.m
+++ b/sources/iTermMutableAttributedStringBuilder.m
@@ -70,6 +70,7 @@
 - (void)dealloc {
    [_attributedString release];
    [_attributes release];
+    [_characterData release];
    [_string release];
    [super dealloc];
 }