Remove memory leaks in the SVG code

src/frontend/com_hardcopy.c

@@ -265,8 +265,11 @@ void com_hardcopy(wordlist *wl)
         }
     }
 
-    if (tempf && *device)
+    if (tempf && *device) {
         (void) unlink(fname);
+    }
+
+    tfree(fname);
 
     /* restore previous graphics context by retrieving the previous currentgraph */
     PopGraphContext();

src/frontend/svg.c

@@ -181,16 +181,20 @@ SVG_Init(void)
         Cfg.ints[SVG_GRID_WIDTH] = 0;
 
     if (cp_getvar("hcopyfont", CP_STRING, &strbuf, sizeof(strbuf))) {
+        tfree(Cfg.strings[SVG_FONT]);
         Cfg.strings[SVG_FONT] = strdup(strbuf);
     }
     else if (!stropts_isset) {
+        tfree(Cfg.strings[SVG_FONT]);
         Cfg.strings[SVG_FONT] = strdup("Helvetica");
     }
 
     if (cp_getvar("hcopyfontfamily", CP_STRING, &strbuf, sizeof(strbuf))) {
+        tfree(Cfg.strings[SVG_FONT_FAMILY]);
         Cfg.strings[SVG_FONT_FAMILY] = strdup(strbuf);
     }
     else if (!stropts_isset){
+        tfree(Cfg.strings[SVG_FONT_FAMILY]);
         Cfg.strings[SVG_FONT_FAMILY] = strdup("Helvetica");
     }
 
@@ -203,9 +207,11 @@ SVG_Init(void)
         sprintf(colorN, "color%d", colorid);
         if (cp_getvar(colorN, CP_STRING, colorstring, sizeof(colorstring))) {
             colors[colorid] = strdup(colorstring);
-            if (colorid == 0)
+            if (colorid == 0) {
+                tfree(Cfg.strings[SVG_BACKGROUND]);
                 Cfg.strings[SVG_BACKGROUND] = strdup(colors[0]);
             }
+        }
         else {
             colors[colorid] = strdup(svgcolors[colorid]);
         }
@@ -302,6 +308,8 @@ SVG_NewViewport(GRAPH *graph)
 
     /* Allocate and initialise per-graph data. */
 
+    tfree(graph->devdep);
+
     graph->devdep = TMALLOC(SVGdevdep, 1);
     ddp = DEVDEP_P(graph);
     ddp->lastx = ddp->lasty = -1;