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 <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/storage/freecom.c

···
 	}
 	line[offset] = 0;
 	usb_stor_dbg(us, "%s\n", line);
-	offset = 0;
 }
 #endif