Revert "Fix uninitialised values for <i> and <dd>"

This reverts commit 0fba2f1a6e.
cf. 0fba2f1a6e (commitcomment-18703355)

parsetagx.c

@@ -126,7 +126,6 @@ parse_tag(char **s, int internal)
 	*(p++) = *(q++);
 	SKIP_BLANKS(q);
     }
-    tagname[0] = '\0';
     while (*q && !IS_SPACE(*q) && !(tagname[0] != '/' && *q == '/') &&
 	   *q != '>' && p - tagname < MAX_TAG_LEN - 1) {
 	*(p++) = TOLOWER(*q);