initialize sections in openSelfDebugInfoWindows

std/coff.zig

@@ -145,7 +145,6 @@ pub const Coff = struct {
         if (self.sections.len == self.coff_header.number_of_sections)
             return;
 
-        self.sections = ArrayList(Section).init(self.allocator);
         try self.sections.ensureCapacity(self.coff_header.number_of_sections);
 
         var file_stream = self.in_file.inStream();

std/debug.zig

@@ -805,7 +805,7 @@ fn openSelfDebugInfoWindows(allocator: *mem.Allocator) !DebugInfo {
         .allocator = allocator,
         .coff_header = undefined,
         .pe_header = undefined,
-        .sections = undefined,
+        .sections = ArrayList(coff.Section).init(allocator),
         .guid = undefined,
         .age = undefined,
     };