Use more effective compile flags

Makefile

@@ -1,7 +1,7 @@
 #
 
 CFLAGS= -Wall -Werror -Wextra -pedantic \
-	-std=gnu99
+	-std=gnu99 -O2 -g
 
 LDFLAGS=-lm -lXaw -lXt -lX11
 # gcc -o xdu -O2 -fno-strength-reduce -fno-strict-aliasing      -L/usr/lib64   xdu.o xwin.o -lXaw -lXmu -lXt -lSM -lICE -lXpm  -lXext -lX11

xdu.c

@@ -999,7 +999,7 @@ void savepschildren(FILE* fp, struct node* nodep, struct rect rect, int showsize
         height,
         top;
     struct node* np;
-    char *name,
+    char *name="n/a",
         label[1024];
     struct rect subrect;
 
@@ -1148,7 +1148,7 @@ void fprintsvgnode(FILE* fp, struct rect rect)
 void fprintsvgnodetext(FILE* fp, int x, int y, long long size, char* name, int showsize)
 {
     char buffer[1024],
-        *text;
+        *text="n/a";
 
     switch (showsize) {
     case 0: