fstests: filter redundant output by getfattr

When getfattr dumps values of all extended attributes (-d option),
it doesn't print empty extended attributes. e.g: user.name. But from
attr-2.4.48 this behavior is changed,  new getfattr prints
user.name="".

The {=""} will break the golden image, so filter the redundant =""
at the end if it has.

Signed-off-by: Zorro Lang <zlang@redhat.com>
Reviewed-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>

tests/generic/020

@@ -35,9 +35,9 @@ _attr()
     return $exit
 }
 
-_getfattr()
+do_getfattr()
 {
-    $GETFATTR_PROG $* 2>$tmp.err >$tmp.out
+    _getfattr $* 2>$tmp.err >$tmp.out
     exit=$?
     _filter $tmp.out
     _filter $tmp.err 1>&2
@@ -49,7 +49,7 @@ _attr_list()
     file=$1
     
     echo "   *** print attributes"
-    if ! _getfattr -d -e text --absolute-names $file
+    if ! do_getfattr -d -e text --absolute-names $file
     then
         echo "      !!! error return"
         return 1
@@ -110,7 +110,7 @@ done
 
 echo "*** check"
 # don't print it all out...
-getfattr --absolute-names $testfile \
+_getfattr --absolute-names $testfile \
     | tee -a $seqres.full \
     | $AWK_PROG '
     	/^#/ { next }