nss: Fix postinstall script

When installing NSS on a read-only rootfs, the current postinstall
scriptlet exits after having run the signing part. This causes an error
when appending the task because the rest of the script is simply ignored
and therefore never run.

(From OE-Core rev: 8f782f7095e718dd9452055af53363beb6bdbece)

Signed-off-by: David Vincent <freesilicon@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-support/nss/nss_3.27.1.bb

@@ -208,18 +208,18 @@ do_install_append_class-target() {
 
 pkg_postinst_${PN} () {
     if [ -n "$D" ]; then
-        for I in $D/${libdir}/lib*.chk; do
+        for I in $D${libdir}/lib*.chk; do
             DN=`dirname $I`
             BN=`basename $I .chk`
             FN=$DN/$BN.so
             shlibsign -i $FN
-	    if [ $? -ne 0 ]; then
-	       exit 1
-	    fi
+            if [ $? -ne 0 ]; then
+                exit 1
+            fi
         done
-        exit 0
+    else
+        signlibs.sh
     fi
-    signlibs.sh
 }
 
 PACKAGES =+ "${PN}-smime"