usb: storage: freecom: Remove redundant assignment to variable offset

The variable offset is being assigned a value that is not being read
afterwards, the assignment is redundant and can be removed.

Cleans up clang scan warning:
drivers/usb/storage/freecom.c:537:2: warning: Value stored to 'offset'
is never read [deadcode.DeadStores]
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Link: https://lore.kernel.org/r/20240207112208.2443237-1-colin.i.king@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/storage/freecom.c

@@ -534,7 +534,6 @@ static void pdump(struct us_data *us, void *ibuffer, int length)
 	}
 	line[offset] = 0;
 	usb_stor_dbg(us, "%s\n", line);
-	offset = 0;
 }
 #endif