Fix linter (#16058)

Fix linter, otherwise #16049 fails the linter.

Author: potuz

changelog/potuz_fix_linter.md

@@ -0,0 +1,3 @@
+### Fixed
+
+- Fix array out of bounds in static analyzer. 

tools/analyzers/recursivelock/analyzer.go

@@ -525,6 +525,9 @@ func hasNestedlock(fullRLockSelector *selIdentList, goPos token.Pos, compareMap
 		if node == (*ast.FuncDecl)(nil) {
 			return ""
 		} else if castedNode, ok := node.(*ast.FuncDecl); ok && castedNode.Recv != nil {
+			if len(castedNode.Recv.List) == 0 || len(castedNode.Recv.List[0].Names) == 0 {
+				return ""
+			}
 			recv = castedNode.Recv.List[0].Names[0]
 			rLockSelector.changeRoot(recv, pass.TypesInfo.ObjectOf(recv))
 		}