dthelp: more coverity fixes

cde/programs/dthelp/parser/canon1/helptag/help.c

@@ -1610,6 +1610,7 @@ else
 	{
 	strcpy(pCharset, charset);
 	mb_free(&charset);
+	free(charset);
 	}
     else
 	strcpy(pCharset, isoString);
@@ -2809,7 +2810,7 @@ int	 tryleng = sizeof(pathbuf);
 int	 pathleng;
 int	 fileleng;
 SEARCH	*thispath;
-char	*mb_inputname;
+char	*mb_inputname = NULL;
 M_WCHAR *wc_try, *wc_outputname;
 int	 tossfile;
 char	 filebuf[BIGBUF];
@@ -2876,6 +2877,8 @@ else
     }
 
 if (try != pathbuf) mb_free(&try);
+
+mb_free(&mb_inputname);
 }
 
 /* Below is a modified version of m_cyclent() that returns a pointer

cde/programs/dthelp/parser/canon1/helptag/xref.c

@@ -155,6 +155,7 @@ strcpy(helpext, ".xrh");
 tex = fopen(helpbase, "w");
 fprintf(tex, "\\gobble\001%s\002%%\n", m_signon);
 fputs("% Generated Cross-Reference Macros (for a particular document)\n", tex);
+fclose(tex);
 if (! xtree.data) return;
 
 n = 0;