kdumpctl: Do not redirect error messages to /dev/null

Does anybody know why are we redirecting stderr to /dev/null when using
kexec load/unload commands? This sounds wrong to me. In case of error I
have no idea what went wrong.

Systemctl already puts all the information in journal. So if we are worried
that user will be bombarded with error messages, that should not be a concern.

So do not redirect stderr to /dev/null.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>

kdumpctl

@@ -435,7 +435,7 @@ load_kdump()
 
 	$KEXEC $KEXEC_ARGS $standard_kexec_args \
 		--command-line="$KDUMP_COMMANDLINE" \
-		--initrd=$TARGET_INITRD $kdump_kernel 2>/dev/null
+		--initrd=$TARGET_INITRD $kdump_kernel
 	if [ $? == 0 ]; then
 		echo "kexec: loaded kdump kernel"
 		return 0
@@ -826,7 +826,7 @@ stop_fadump()
 
 stop_kdump()
 {
-	$KEXEC -p -u 2>/dev/null
+	$KEXEC -p -u
 	if [ $? != 0 ]; then
 		echo "kexec: failed to unload kdump kernel"
 		return 1