phy: phy-can-transceiver: Decouple assignment and definition in probe

phy: phy-can-transceiver: Decouple assignment and definition in probe

The code like

	int foo = X;
	...
	if (bar)
		foo = Y;

is prone to subtle mistakes and hence harder to maintain as the foo value
may be changed inadvertently while code in '...' grown in lines. On top
it's harder to navigate to understand the possible values of foo when branch
is not taken (requires to look somewhere else in the code, far from the piece
at hand).

Besides that in case of taken branch the foo will be rewritten, which is
not a problem per se, just an unneeded operation.

Decouple assignment and definition to use if-else to address the inconveniences
described above.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20260513220336.369628-6-andriy.shevchenko@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>