fix: can't parse "12, 34, 56“ using "%d,%d,%d"

[royqh1979]

In c , sscanf can parse "12, 34, 56“ using "%d,%d,%d"
`
#include <stdio.h>
#include <string.h>

int main(){
int a,b,c;

sscanf(" 12, 34, 56","%d,%d,%d",&a,&b,&c) ;

printf("%d,%d,%d\n",a,b,c);

return 0;

}
`

But now scanf can't do that.
This patch fixes it.