DWARF-5: Initialization due to a false compiler warning

DWARF-5: Initialization due to a false compiler warning

gcc-6.3.1-1.fc25.x86_64

dwarf2read.c: In function ‘void create_debug_type_hash_table(dwo_file*, dwarf2_section_info*, htab*&, rcuh_kind)’:
dwarf2read.c:4776:32: error: ‘header.comp_unit_head::type_offset_in_tu.cu_offset::cu_off’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
dwarf2read.c:4816:21: error: ‘header.comp_unit_head::signature’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
cc1plus: all warnings being treated as errors

gdb/ChangeLog
2017-02-26  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* dwarf2read.c (create_debug_type_hash_table): Initialize
	header.signature and header.type_offset_in_tu.