genpeimg: fix mistaken section header size.

According to Microsoft docs and observation of real images, section
headers are 40 bytes, not 36.

Signed-off-by: Jeremy Drake <jeremyd2019@users.sourceforge.net>
Signed-off-by: Martin Storsjö <martin@martin.st>
diff --git a/mingw-w64-tools/genpeimg/src/img.h b/mingw-w64-tools/genpeimg/src/img.h
index 4a927c8..6e969a1 100644
--- a/mingw-w64-tools/genpeimg/src/img.h
+++ b/mingw-w64-tools/genpeimg/src/img.h
@@ -66,7 +66,7 @@
   } pe_filehdr;
   size_t optional_hdr_pos;
   size_t section_list;
-  size_t section_list_sz; /* Each section entry has 36 bytes size.  */
+  size_t section_list_sz; /* Each section entry has 40 bytes size.  */
   int is_64bit : 1;
   int is_bigendian : 1;
 } pe_image;
diff --git a/mingw-w64-tools/genpeimg/src/img_pe.c b/mingw-w64-tools/genpeimg/src/img_pe.c
index 71794ab..91aef95 100644
--- a/mingw-w64-tools/genpeimg/src/img_pe.c
+++ b/mingw-w64-tools/genpeimg/src/img_pe.c
@@ -133,7 +133,7 @@
       return 0;
     }
   pe->section_list = pe->optional_hdr_pos + pe->pe_filehdr.szOptHdr;
-  pe->section_list_sz = ((size_t) pe->pe_filehdr.numsecs) * (4 * 9);
+  pe->section_list_sz = ((size_t) pe->pe_filehdr.numsecs) * 40;
   return 1;
 }