PCI/switchtec: Declare local state_names[] as static

The local state_names[] array is constant and need not be allocated and
populated each time we enter stuser_set_state(). Declare it as static.

See the link below for the discussion.

https://lore.kernel.org/r/[e-mail]/

[bhelgaas: simplify commit log]
Suggested-by: Krzysztof Wilczyński <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Kelvin Cao <[e-mail]>
Signed-off-by: Bjorn Helgaas <[e-mail]>
Reviewed-by: Logan Gunthorpe <[e-mail]>

drivers/pci/switch/switchtec.c

···
 {
 	/* requires the mrpc_mutex to already be held when called */
 
-	const char * const state_names[] = {
+	static const char * const state_names[] = {
 		[MRPC_IDLE] = "IDLE",
 		[MRPC_QUEUED] = "QUEUED",
 		[MRPC_RUNNING] = "RUNNING",