perf beauty arch_errno_names: Fix shellcheck issue about local variables

Running shellcheck on arch_errno_names.sh generates below warning:

In arch_errno_names.sh line 20:
	local arch="$1"
        ^--------^ SC3043 (warning): In POSIX sh, 'local' is undefined.

......

In arch_errno_names.sh line 61:
	local arch
        ^--------^ SC3043 (warning): In POSIX sh, 'local' is undefined.

In arch_errno_names.sh line 67:
		printf '\t\treturn errno_to_name__%s(err);\n' $(arch_string "$arch")
                                                              ^--------------------^ SC2046 (warning): Quote this to prevent word splitting.

In arch_errno_names.sh line 69:
	printf '\treturn errno_to_name__%s(err);\n' $(arch_string "$default")
                                                    ^-----------------------^ SC2046 (warning): Quote this to prevent word splitting.

Fixed the warnings by:
- Fixing shellcheck warnings for local usage, by removing
  local from the variable names
- Adding quotes to avoid word splitting

Signed-off-by: Kajol Jain <kjain@linux.ibm.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Disha Goel <disgoel@linux.vnet.ibm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: linuxppc-dev@lists.ozlabs.org
Link: https://lore.kernel.org/r/20230709182800.53002-15-atrajeev@linux.vnet.ibm.com
Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/trace/beauty/arch_errno_names.sh

@@ -17,8 +17,7 @@ arch_string()
 
 asm_errno_file()
 {
-	local arch="$1"
-	local header
+	arch="$1"
 
 	header="$toolsdir/arch/$arch/include/uapi/asm/errno.h"
 	if test -r "$header"; then
@@ -30,8 +29,7 @@ asm_errno_file()
 
 create_errno_lookup_func()
 {
-	local arch=$(arch_string "$1")
-	local nr name
+	arch=$(arch_string "$1")
 
 	printf "static const char *errno_to_name__%s(int err)\n{\n\tswitch (err) {\n" $arch
 
@@ -44,8 +42,8 @@ create_errno_lookup_func()
 
 process_arch()
 {
-	local arch="$1"
-	local asm_errno=$(asm_errno_file "$arch")
+	arch="$1"
+	asm_errno=$(asm_errno_file "$arch")
 
 	$gcc $CFLAGS $include_path -E -dM -x c $asm_errno \
 		|grep -hE '^#define[[:blank:]]+(E[^[:blank:]]+)[[:blank:]]+([[:digit:]]+).*' \
@@ -56,9 +54,8 @@ process_arch()
 
 create_arch_errno_table_func()
 {
-	local archlist="$1"
-	local default="$2"
-	local arch
+	archlist="$1"
+	default="$2"
 
 	printf 'const char *arch_syscalls__strerrno(const char *arch, int err)\n'
 	printf '{\n'