samba: conditionalize sed call for onnode

| sed: can't read .../4.4.5-r0/image/usr/bin/onnode: No such file or directory

Signed-off-by: Andreas Oberritter <obi@opendreambox.org>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
(cherry picked from commit cc32689a5b)
Signed-off-by: Armin Kuster <akuster808@gmail.com>

meta-networking/recipes-connectivity/samba/samba_4.4.5.bb

@@ -142,7 +142,9 @@ do_install_append() {
     done
 
     # fix file-rdeps qa warning
-    sed -i 's:\(#!/bin/\)bash:\1sh:' ${D}${bindir}/onnode
+    if [ -f ${D}${bindir}/onnode ]; then
+        sed -i 's:\(#!/bin/\)bash:\1sh:' ${D}${bindir}/onnode
+    fi
 
     rm -rf ${D}/run ${D}${localstatedir}/run ${D}${localstatedir}/log
 }