usb: usblp: clean up assignment inside if conditions

usb: usblp: clean up assignment inside if conditions

This patch cleans up a few cases where assignments were made
inside of if conditions, like

if ((rv = func()) < 0)

into two lines, to improve readability and be more in-line with
Linux kernel coding style. It also cleans up checkpatch warnings
like:

ERROR: do not use assignment in if condition

No functional change, just a style and maintainability fix.

Signed-off-by: Darshan Rathod <darshan.rathod@siqol.com>
Link: https://lore.kernel.org/r/20250718091045.264129-1-darshan.rathod@siqol.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>