{kernel, module}.bbclass: don't run depmod for module packages during do_rootfs

* depmod already gets executed by pkg_postinst_kernel-image.

* If you build a module using module.bbclass, pkg_postinst returns 1 in
  do_rootfs, causing pkg_postinst to run again on first boot. To improve
  this situation, I copied pkg_postinst from kernel.bbclass to module.bbclass.
  This was rejected by Koen, because he doesn't like the code from
  kernel.bblcass, which uses ${STAGING_DIR_KERNEL}. Richard then suggested
  that calling depmod during do_rootfs wasn't necessary at all, because
  it already gets done by kernel-image.

(From OE-Core rev: c7809c03080925b5e9171df5c9175c7c6420b376)

Signed-off-by: Andreas Oberritter <obi@opendreambox.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/kernel.bbclass

@@ -276,9 +276,7 @@ fi
 }
 
 pkg_postinst_modules () {
-if [ -n "$D" ]; then
-	${HOST_PREFIX}depmod -A -b $D -F ${STAGING_KERNEL_DIR}/System.map-${KERNEL_VERSION} ${KERNEL_VERSION}
-else
+if [ -z "$D" ]; then
 	depmod -a
 	update-modules || true
 fi

meta/classes/module.bbclass

@@ -37,15 +37,14 @@ module_do_install() {
 }
 
 pkg_postinst_append () {
-	if [ -n "$D" ]; then
-		exit 1
-	fi
+if [ -z "$D" ]; then
 	depmod -a
 	update-modules || true
+fi
 }
 
 pkg_postrm_append () {
-	update-modules || true
+update-modules || true
 }
 
 EXPORT_FUNCTIONS do_compile do_install