ice: Fix signedness bug in ice_init_interrupt_scheme()

If pci_alloc_irq_vectors() can't allocate the minimum number of vectors
then it returns -ENOSPC so there is no need to check for that in the
caller.  In fact, because pf->msix.min is an unsigned int, it means that
any negative error codes are type promoted to high positive values and
treated as success.  So here, the "return -ENOMEM;" is unreachable code.
Check for negatives instead.

Now that we're only dealing with error codes, it's easier to propagate
the error code from pci_alloc_irq_vectors() instead of hardcoding
-ENOMEM.

Fixes: 79d97b8 ("ice: remove splitting MSI-X between features")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
Link: https://patch.msgid.link/b16e4f01-4c85-46e2-b602-fce529293559@stanley.mountain
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/intel/ice/ice_irq.c

@@ -149,8 +149,8 @@ int ice_init_interrupt_scheme(struct ice_pf *pf)
 
 	vectors = pci_alloc_irq_vectors(pf->pdev, pf->msix.min, vectors,
 					PCI_IRQ_MSIX);
-	if (vectors < pf->msix.min)
-		return -ENOMEM;
+	if (vectors < 0)
+		return vectors;
 
 	ice_init_irq_tracker(pf, pf->msix.max, vectors);