Trim spaces at the end of the buffer before trying to convert it to an oid

This allows to write entries in sysctl.conf with spaces before the '=' like
kern.ipc.shmmax = 9663676416

Sponsored by:	Gandi.net

sbin/sysctl/sysctl.c

@@ -233,6 +233,12 @@ parse(const char *string, int lineno)
 		newval = cp;
 		newsize = strlen(cp);
 	}
+	/* Trim spaces */
+	cp = bufp + strlen(bufp) - 1;
+	while (cp >= bufp && isspace((int)*cp)) {
+		*cp = '\0';
+		cp--;
+	}
 	len = name2oid(bufp, mib);
 
 	if (len < 0) {