[gtk-doc] mkdb: fixed uninitialized variable access

[Stefan Kost <stefkost src gnome org>]

commit 9f036ba59450c2bb0a0d6d5471291cdd6c395373
Author: Stefan Kost <ensonic users sf net>
Date:   Tue Jan 5 15:28:08 2010 +0200

    mkdb: fixed uninitialized variable access

 gtkdoc-mkdb.in |   13 +++++++------
 1 files changed, 7 insertions(+), 6 deletions(-)
---
diff --git a/gtkdoc-mkdb.in b/gtkdoc-mkdb.in
index 416f6e7..32ad234 100755
--- a/gtkdoc-mkdb.in
+++ b/gtkdoc-mkdb.in
@@ -1334,12 +1334,13 @@ sub OutputMacro {
 	$desc .= "<programlisting>$decl_out</programlisting>\n";
     } else {
 	$desc .= "<programlisting>" . &MakeReturnField("#define") . "$symbol";
-	# Align each line so that if should all line up OK.
-	my $pad = ' ' x ($RETURN_TYPE_FIELD_WIDTH - length ("#define "));
-	$declaration =~ m/^\s*#\s*define\s+\w+(\([^\)]*\))/;
-	my $args = $1;
-	$args =~ s/\n/\n$pad/gm;
-	$desc .= &CreateValidSGML ($args);
+	if ($declaration =~ m/^\s*#\s*define\s+\w+(\([^\)]*\))/) {
+            my $args = $1;
+            my $pad = ' ' x ($RETURN_TYPE_FIELD_WIDTH - length ("#define "));
+            # Align each line so that if should all line up OK.
+            $args =~ s/\n/\n$pad/gm;
+            $desc .= &CreateValidSGML ($args);
+        }
 	$desc .= "</programlisting>\n";
     }