A potential Format String bug found in smtp.c about mailsend HOT 2 OPEN

#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>

void showVerbose(char *format,...)
{
    va_list
        args;

    va_start(args,format);
    vfprintf(stdout,format,args);
    (void) fflush(stdout);
    va_end(args);

    va_start(args,format);
    vfprintf(stdout,format,args);
    (void) fflush(stdout);
    va_end(args);
}

int main(int argc, char *argv[])
{
    char
        buf[1024];

    (void) strncpy(buf,"this is a test\n",sizeof(buf)-1);
    showVerbose(buf);
    return(0);
}

infer --version
Infer version v1.1.0
Copyright 2009 - present Facebook. All Rights Reserved.

infer run -- gcc -g -Wall test.c
Capturing in make/cc mode...
Found 1 source file to analyze in /home/muquit/junk/infer-out
1/1 [################################################################################] 100% 56.294ms

  No issues found