powerpc: unrel_branch_check.sh: fix shellcheck complaints

No functional change
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200811140435.20957-2-sfr@canb.auug.org.au

arch/powerpc/tools/unrel_branch_check.sh

+#!/bin/bash
 # Copyright © 2016 IBM Corporation
 #
 # This program is free software; you can redistribute it and/or
@@ -26,7 +27,7 @@ awk '{print $1}'
 
 BRANCHES=$(
 $objdump -R "$vmlinux" -D --start-address=0xc000000000000000           \
-		--stop-address=${end_intr} |
+		--stop-address="$end_intr" |
 grep -e "^c[0-9a-f]*:[[:space:]]*\([0-9a-f][0-9a-f][[:space:]]\)\{4\}[[:space:]]*b" |
 grep -v '\<__start_initialization_multiplatform>' |
 grep -v -e 'b.\?.\?ctr' |
@@ -40,12 +41,12 @@ awk '{ print $1 ":" $6 ":0x" $7 ":" $8 " "}'
 
 for tuple in $BRANCHES
 do
-	from=`echo $tuple | cut -d':' -f1`
-	branch=`echo $tuple | cut -d':' -f2`
-	to=`echo $tuple | cut -d':' -f3 | sed 's/cr[0-7],//'`
-	sym=`echo $tuple | cut -d':' -f4`
+	from=$(echo "$tuple" | cut -d':' -f1)
+	branch=$(echo "$tuple" | cut -d':' -f2)
+	to=$(echo "$tuple" | cut -d':' -f3 | sed 's/cr[0-7],//')
+	sym=$(echo "$tuple" | cut -d':' -f4)
 
-	if (( $to > $end_intr ))
+	if (( to > end_intr ))
 	then
 		if [ -z "$bad_branches" ]; then
 			echo "WARNING: Unrelocated relative branches"