fix: local variable 'benefit_amount' referenced before assignment (#20949)

diff --git a/erpnext/hr/doctype/employee_benefit_application/employee_benefit_application.py b/erpnext/hr/doctype/employee_benefit_application/employee_benefit_application.py
index fea4246..feaa925 100644
--- a/erpnext/hr/doctype/employee_benefit_application/employee_benefit_application.py
+++ b/erpnext/hr/doctype/employee_benefit_application/employee_benefit_application.py
@@ -190,6 +190,7 @@
 	component_max_benefit, depends_on_payment_days = frappe.db.get_value("Salary Component",
 		salary_component, ["max_benefit_amount", "depends_on_payment_days"])
 
+	benefit_amount = 0
 	if benefit_application:
 		benefit_amount = frappe.db.get_value("Employee Benefit Application Detail",
 			{"parent": benefit_application[0][0], "earning_component": salary_component}, "amount")