Fix script variable error

Author: RogerX87

platform/innovium/sonic-platform-modules-wistron/6512-32r/utils/sonic-qsfp-eeprom-monitor

@@ -244,7 +244,7 @@ bmc_update_dynamic()
 			err=1
 		fi
 
-		pwr_path="/sys/bus/i2c/devices/0-00"${port_map[$1]}"/power_mode"
+		pwr_path="/sys/bus/i2c/devices/0-00"${port_map[$((port + 1))]}"/power_mode"
 		pwr_mode=$(cat $pwr_path | awk '{printf $1}')
 		if [ $pwr_mode -ne ${port_pre_mode[$port]} ]; then
 			ipmitool raw 0x30 0x25 0x1 0xa0 0x0 93 $pwr_mode
@@ -283,7 +283,7 @@ bmc_update_dynamic()
 		else
 			err=1
 		fi
-		pwr_path="/sys/bus/i2c/devices/0-00"${port_map[$1]}"/power_mode"
+		pwr_path="/sys/bus/i2c/devices/0-00"${port_map[$((port + 1))]}"/power_mode"
 		pwr_mode=$(cat $pwr_path | awk '{printf $1}')
 		if [ $pwr_mode -ne ${port_pre_mode[$port]} ]; then
 			ipmitool raw 0x30 0x25 0x1 0xa0 0x0 26 $pwr_mode