🚀 go-pugleaf

The following program does compile, but when i run it under UNIX it produces
a "segmenattion fault" after the return statement int main() is reached.
The code is standard ansi c, and i cannot find any errors.
If you have an explanation or a solution, please mail to
masc0827@rohan.sdsu.edu (Frank Rustemeyer). Thanks in advance.

-------------------------------------------------------------------------

/* Shortest program to produce the error.
// If any of the lines (1),(2),(3) are deleted, the error will not occur.
// In line (2),  it has no effect to use NULL, or 0 instead of
// (struct list *) 0. */

#include <stdio.h>
#include <malloc.h>


struct list               
{   int x;                                      /* (1) */
    int *line;
    struct list *nxt; 
    } ;                         

struct list *root;


void declare(void)
{   struct list *l;

    if (!(root = (struct list *) malloc(sizeof (struct list *))))
       return;
    l = root;              
    l->nxt = (struct list *) 0;                  /*  (2)  */
    } 

void nothing(void) { printf ("!\n");}

int main(void)
{   declare();
    nothing();                                   /*  (3)  */
    return 1;
    }