sms-pdu-decode family: fix VP-Relative header spacing When VP-Relative is small enough to be reckoned in 5 min or 30 min units, it was printed incorrectly, with a cosmetic defect of one extra space. Fix this bug.

/*
 * Compare strings:  s1>s2: >0  s1==s2: 0  s1<s2: <0
 */

strcmp(s1, s2)
	register char *s1, *s2;
{
	while (*s1 == *s2++)
		if (*s1++=='\0')
			return(0);
	return(*s1 - *--s2);
}