fix wrong variable name (#11050)

diff --git a/erpnext/hr/doctype/process_payroll/process_payroll.py b/erpnext/hr/doctype/process_payroll/process_payroll.py
index 55c0cce..0e329a7 100644
--- a/erpnext/hr/doctype/process_payroll/process_payroll.py
+++ b/erpnext/hr/doctype/process_payroll/process_payroll.py
@@ -284,7 +284,7 @@
 					})
 
 			# Deductions
-			for acc, amt in deductions.items():
+			for acc, amount in deductions.items():
 				payable_amount -= flt(amount, precision)
 				accounts.append({
 						"account": acc,