ACPI: SPCR: Prefix error messages with FW_BUG

The table values that are not defined in the specification are
considered non-fatal errors in the code.

However, they are firmware bugs, so point this out in the messages by
prefixing them with FW_BUG.

Signed-off-by: Andy Shevchenko <[e-mail]>
Signed-off-by: Rafael J. Wysocki <[e-mail]>

drivers/acpi/spcr.c

···
 		u32 bit_width = table->serial_port.access_width;
 
 		if (bit_width > ACPI_ACCESS_BIT_MAX) {
-			pr_err("Unacceptable wide SPCR Access Width.  Defaulting to byte size\n");
+			pr_err(FW_BUG "Unacceptable wide SPCR Access Width. Defaulting to byte size\n");
 			bit_width = ACPI_ACCESS_BIT_DEFAULT;
 		}
 		switch (ACPI_ACCESS_BIT_WIDTH((bit_width))) {
 		default:
-			pr_err("Unexpected SPCR Access Width.  Defaulting to byte size\n");
+			pr_err(FW_BUG "Unexpected SPCR Access Width. Defaulting to byte size\n");
 			fallthrough;
 		case 8:
 			iotype = "mmio";