soc/amd/common/espi_util: clarify espi_open_io_window

Calling espi_open_generic_io_window in espi_open_io_window depends on
the condition in the preceding if statement, so move the command into an
else block to make it more obvious that this is the case.

TEST=Timeless build results in identical image.

Change-Id: I3039817afd79c30a2df2f2f54e7848f52dc2c487
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44353
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>

src/soc/amd/common/block/lpc/espi_util.c

@@ -183,9 +183,9 @@ int espi_open_io_window(uint16_t base, size_t size)
 	if (std_io != -1) {
 		espi_enable_decode(std_io);
 		return 0;
+	} else {
+		return espi_open_generic_io_window(base, size);
 	}
-
-	return espi_open_generic_io_window(base, size);
 }
 
 static int espi_find_mmio_window(uint32_t win_base)