Fix a problem computing the size fields in the PE format header.

PR 25029
	* peXXigen.c (_bfd_XXi_swap_aouthdr_out): Ignore empty sections
	when computing the sizes stored in the headers.

bfd/ChangeLog

@@ -1,3 +1,9 @@
+2019-12-05  Nick Clifton  <nickc@redhat.com>
+
+	PR 25029
+	* peXXigen.c (_bfd_XXi_swap_aouthdr_out): Ignore empty sections
+	when computing the sizes stored in the headers.
+
 2019-12-03  Alan Modra  <amodra@gmail.com>
 
 	PR 25230

bfd/peXXigen.c

@@ -723,6 +723,9 @@ _bfd_XXi_swap_aouthdr_out (bfd * abfd, void * in, void * out)
       {
 	int rounded = FA (sec->size);
 
+	if (rounded == 0)
+	  continue;
+
 	/* The first non-zero section filepos is the header size.
 	   Sections without contents will have a filepos of 0.  */
 	if (hsize == 0)