Whitespace in debug log

Imported from https://youtrack.roxen.com/issue/PIKE-211

Reported by Marcus Wellhardh wellhard@roxen.com

Debug log contains a lot of whitespace after this:

15:43:58   0d13h43m : >> ### Thread 0x7fbab5030700 - Handle Thread [13] - busy for 1.799s:
15:44:04            : >> pike/lib/master.pike:1102: roxen_master()->programs_reverse_lookup(object_program(Standards.ASN1.Types))
15:44:04            : >> pike/lib/master.pike:4329: roxen_master()->describe_object(Standards.ASN1.Types)
15:44:04            : >> pike/lib/master.pike:4238: roxen_master()->describe_module(@0=Standards.ASN1.Types,UNDEFINED)
15:44:04            : >> pike/lib/modules/Standards.pmod/ASN1.pmod/Types.pmod:281: Standards.ASN1.Types.OctetString("( 1.2.840.113556.1.4.7000.102.51931 NAME 'msExchArchiveDatabaseLinkSL' SYNTAX '1.3.6.1.4.1.1466.115.121.1.40' SINGLE-VALUE )")->_sprintf(79)
15:44:04   0d13h43m : >> pike/lib/modules/Standards.pmod/ASN1.pmod/Types.pmod:219:
15:44:04            : >>     Standards.ASN1.Types.Set(({ /* 4011 elements */

Entire debug log will be added later.