[libxslt] Fix uninitialized read of xsl:number token

[Nick Wellnhofer <nwellnhof src gnome org>]

commit c5eb6cf3aba0af048596106ed839b4ae17ecbcb1
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Sat Apr 27 11:19:48 2019 +0200

    Fix uninitialized read of xsl:number token
    
    Found by OSS-Fuzz.

 libxslt/numbers.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/libxslt/numbers.c b/libxslt/numbers.c
index 89e1f668..75c31eba 100644
--- a/libxslt/numbers.c
+++ b/libxslt/numbers.c
@@ -382,7 +382,10 @@ xsltNumberFormatTokenize(const xmlChar *format,
                tokens->tokens[tokens->nTokens].token = val - 1;
                ix += len;
                val = xmlStringCurrentChar(NULL, format+ix, &len);
-           }
+           } else {
+                tokens->tokens[tokens->nTokens].token = (xmlChar)'0';
+                tokens->tokens[tokens->nTokens].width = 1;
+            }
        } else if ( (val == (xmlChar)'A') ||
                    (val == (xmlChar)'a') ||
                    (val == (xmlChar)'I') ||