if comma

//-std=c99 -Wall -Wextra -Wpedantic -Wshadow

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

int main (int argc, char **argv){

char *p1, *p2;

p1 = malloc(10);

if(!p1)
{
    printf("error!\n");
    return 1;
}

free(p1);

if(p2 = malloc(10), !p2)
{
    printf("error!\n");
    return 1;
}

free(p2);

printf("INFO: exit.\n");

return 0;
}