[Pidgin] #5536: plug small leak in gtkimhtml

[Pidgin]

#5536: plug small leak in gtkimhtml
--------------------------+-------------------------------------------------
 Reporter:  gaul          |       Type:  patch
   Status:  new           |   Priority:  minor
Component:  pidgin (gtk)  |    Version:  2.4.1
 Keywords:  leak          |    Pending:  0    
--------------------------+-------------------------------------------------
 ==3321== 4 bytes in 1 blocks are definitely lost in loss record 3 of 273
 ==3321==    at 0x4006A6E: malloc (vg_replace_malloc.c:207)
 ==3321==    by 0x4006BEF: realloc (vg_replace_malloc.c:429)
 ==3321==    by 0xA1C9BA: g_realloc (in /lib/libglib-2.0.so.0.1400.6)
 ==3321==    by 0xA362AB: (within /lib/libglib-2.0.so.0.1400.6)
 ==3321==    by 0xA3730C: g_string_sized_new (in
 /lib/libglib-2.0.so.0.1400.6)
 ==3321==    by 0xA37354: g_string_new (in /lib/libglib-2.0.so.0.1400.6)
 ==3321==    by 0x80B20C0: gtk_imhtml_get_html_opt (gtkimhtml.c:2207)
 ==3321==    by 0x80B3A23: gtk_imhtml_insert_html_at_iter
 (gtkimhtml.c:2758)
 ==3321==    by 0x80B24E6: gtk_imhtml_append_text_with_images
 (gtkimhtml.c:2302)

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Ticket URL: <http://developer.pidgin.im/ticket/5536>
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