livepatch/selftests: use "$@" to preserve argument list

The livepatch selftest functions.sh library uses "$*" and an
intermediate variable to extract and then pass arguments from function
to function call. The effect of this combination is that the argument
list is flattened into a single argument. Sometimes this is benign, but
in cases like __load_mod(), the modprobe invocation will interpret all
the module parameters as a single parameter.

Drop the intermediate variable and use the "$@" special parameter as
described in the bash manual.

Link: https://www.gnu.org/software/bash/manual/bash.html#Special-Parameters
Signed-off-by: Joe Lawrence <[e-mail]>
Reviewed-by: Kamalesh Babulal <[e-mail]>
Acked-by: Miroslav Benes <[e-mail]>
Signed-off-by: Petr Mladek <[e-mail]>

tools/testing/selftests/livepatch/functions.sh

···
 
 function __load_mod() {
 	local mod="$1"; shift
-	local args="$*"
 
-	local msg="% modprobe $mod $args"
+	local msg="% modprobe $mod $*"
 	log "${msg%% }"
-	ret=$(modprobe "$mod" "$args" 2>&1)
+	ret=$(modprobe "$mod" "$@" 2>&1)
 	if [[ "$ret" != "" ]]; then
 		die "$ret"
 	fi
···
 #	params  - module parameters to pass to modprobe
 function load_mod() {
 	local mod="$1"; shift
-	local args="$*"
 
 	is_livepatch_mod "$mod" &&
 		die "use load_lp() to load the livepatch module $mod"
 
-	__load_mod "$mod" "$args"
+	__load_mod "$mod" "$@"
 }
 
 # load_lp_nowait(modname, params) - load a kernel module with a livepatch
···
 #	params  - module parameters to pass to modprobe
 function load_lp_nowait() {
 	local mod="$1"; shift
-	local args="$*"
 
 	is_livepatch_mod "$mod" ||
 		die "module $mod is not a livepatch"
 
-	__load_mod "$mod" "$args"
+	__load_mod "$mod" "$@"
 
 	# Wait for livepatch in sysfs ...
 	loop_until '[[ -e "/sys/kernel/livepatch/$mod" ]]' ||
···
 #	params  - module parameters to pass to modprobe
 function load_lp() {
 	local mod="$1"; shift
-	local args="$*"
 
-	load_lp_nowait "$mod" "$args"
+	load_lp_nowait "$mod" "$@"
 
 	# Wait until the transition finishes ...
 	loop_until 'grep -q '^0$' /sys/kernel/livepatch/$mod/transition' ||
···
 #	params  - module parameters to pass to modprobe
 function load_failing_mod() {
 	local mod="$1"; shift
-	local args="$*"
 
-	local msg="% modprobe $mod $args"
+	local msg="% modprobe $mod $*"
 	log "${msg%% }"
-	ret=$(modprobe "$mod" "$args" 2>&1)
+	ret=$(modprobe "$mod" "$@" 2>&1)
 	if [[ "$ret" == "" ]]; then
 		die "$mod unexpectedly loaded"
 	fi