dthelp: compiler warning and coverity warning fixes

cde/programs/dthelp/parser/pass2/build/out.c

@@ -544,6 +544,8 @@ void srefout(M_NOPAR)
       fputs(ndif, dtd) ;
       }
     SUBONE
+    
+    free(mapbysref);
     }
 
 /* Output one element block in a template */

cde/programs/dthelp/parser/pass2/htag2/custom.c

@@ -231,7 +231,7 @@ SEARCH *searchp;
 char *mb_entcontent;
 
 mb_entcontent = MakeMByteString(entcontent);
-if (!*mb_entcontent) return NULL; /* null file name, don't open a directory */
+if (!mb_entcontent || !*mb_entcontent) return NULL; /* null file name, don't open a directory */
 
 open = fopen(mb_entcontent, "r");
 if (open)

cde/programs/dthelp/parser/pass2/util/conutil.c

@@ -424,8 +424,12 @@ if (loading) newdlm = (char **) calloc(trysize, sizeof(M_WCHAR *));
 if (! newtransit || (loading && ! newdlm))
     {
     trysize = NUMDELIM + 1;
+    free(newtransit);
     newtransit = (int *) calloc(NUMCON * trysize, sizeof(int));
-    if (loading) newdlm = (char **) calloc(trysize, sizeof(M_WCHAR *));
+    if (loading) {
+      free(newdlm);
+      newdlm = (char **) calloc(trysize, sizeof(M_WCHAR *));
+    }
     }
 if (! newtransit || (loading && ! newdlm))
     {

cde/programs/dthelp/parser/pass2/util/fclndir.c

@@ -144,6 +144,7 @@ void copyfile(pfile1,pfile2)
 	ret = system(pcmd);
 	ret = snprintf(pcmd, slen, "touch %s",pfile2);
 	ret = system(pcmd);
+	free(pcmd);
 }
 
 int nextchar(file, data)

cde/programs/dthelp/parser/pass2/util/malloc.c

@@ -84,16 +84,13 @@ void *m_wctrace(
 #endif
   ) ;
 
-void m_free(block, msg)
-  void *block ;
-  char *msg ;
+void m_free(void *block, char *msg)
   {
     char buffer[32] ;
 
 #if defined(MSDOS)
     if (m_heapchk) m_heapdump() ;
 #endif
-    free(block) ;
     if (m_malftrace) {
 #if defined(hpux) || defined(_AIX) || defined(sun) || defined(USL) || defined(__uxp__)
       snprintf(buffer, 32, "%5x:%5x",
@@ -107,6 +104,7 @@ void m_free(block, msg)
       m_trace(msg) ;
       m_trace("\n") ;
       }      
+    free(block) ;
 #if defined(MSDOS)
     if (m_heapchk) m_heapdump() ;
 #endif