kernel-doc/rst: fix use of uninitialized value

I'm not quite sure why the errors below are happening, but this fixes
them.

Use of uninitialized value in string ne at ./scripts/kernel-doc line 1819, <IN> line 6494.
Use of uninitialized value $_[0] in join or string at ./scripts/kernel-doc line 1759, <IN> line 6494.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/scripts/kernel-doc b/scripts/kernel-doc
index 2fc8fad5195e..babb374c043d 100755
--- a/scripts/kernel-doc
+++ b/scripts/kernel-doc
@@ -1803,7 +1803,8 @@ sub output_function_rst(%) {
         } else {
             print "      ``$parameter``\n";
         }
-        if ($args{'parameterdescs'}{$parameter_name} ne $undescribed) {
+        if (defined($args{'parameterdescs'}{$parameter_name}) &&
+            $args{'parameterdescs'}{$parameter_name} ne $undescribed) {
             my $oldprefix = $lineprefix;
             $lineprefix = "        ";
             output_highlight_rst($args{'parameterdescs'}{$parameter_name});