platform/x86: thinkpad_acpi: Fix inconsistent indenting

Eliminate the follow smatch warning:

drivers/platform/x86/thinkpad_acpi.c:7942 volume_write() warn:
inconsistent indenting.
Reported-by: NAbaci Robot <abaci@linux.alibaba.com>
Signed-off-by: NJiapeng Chong <jiapeng.chong@linux.alibaba.com>
Link: https://lore.kernel.org/r/1621837438-70790-1-git-send-email-jiapeng.chong@linux.alibaba.comSigned-off-by: NHans de Goede <hdegoede@redhat.com>

drivers/platform/x86/thinkpad_acpi.c

@@ -7938,7 +7938,7 @@ static int volume_write(char *buf)
 				continue;
 			} else if (sscanf(cmd, "level %u", &l) == 1 &&
 				   l >= 0 && l <= TP_EC_VOLUME_MAX) {
-					new_level = l;
+				new_level = l;
 				continue;
 			}
 		}