get_attr_value: do not do trim_chars

trim_chars was called only in debug mode and the results of the get_attr_val
for value=" something " in debug mode differ from normal and fastmem mode.

[ From commit c4500039b2 on the witekfl
  branch.  --KON ]

src/document/html/parser/parse.c

@@ -211,7 +211,7 @@ found_endattr:
 			mem_free(saved_attr);
 		}
 
-		set_mem_comment(trim_chars(attr, ' ', NULL), name, strlen(name));
+		set_mem_comment(attr, name, strlen(name));
 		return attr;
 
 	} else {