spi: bcm-qspi: return error if neither hif_mspi nor mspi is available

In the Linux kernel, the following vulnerability has been resolved:

spi: bcm-qspi: return error if neither hif_mspi nor mspi is available

If neither a "hif_mspi" nor "mspi" resource is present, the driver will

just early exit in probe but still return success. Apart from not doing

anything meaningful, this would then also lead to a null pointer access

on removal, as platform_get_drvdata() would return NULL, which it would

then try to dereference when trying to unregister the spi master.

Fix this by unconditionally calling devm_ioremap_resource(), as it can

handle a NULL res and will then return a viable ERR_PTR() if we get one.

The "return 0;" was previously a "goto qspi_resource_err;" where then

ret was returned, but since ret was still initialized to 0 at this place

this was a valid conversion in 63c5395bb7a9 ("spi: bcm-qspi: Fix

use-after-free on unbind"). The issue was not introduced by this commit,

only made more obvious.