Merge pull request #1427 from xanathar/pr/detect_lenght_overflow_fix

Fixes an overflow bug that may occasionally panic if gir is built in debug

src/analysis/function_parameters.rs

@@ -460,7 +460,7 @@ fn detect_length<'a>(
     par: &library::Parameter,
     parameters: &'a [library::Parameter],
 ) -> Option<&'a library::Parameter> {
-    if !is_length(par) {
+    if !is_length(par) || pos == 0 {
         return None;
     }