echo: fixed driver init on x86_64.

* tested with echo3g without external box connected.

src/add-ons/kernel/drivers/audio/echo/util.c

@@ -34,7 +34,7 @@
 #include "debug.h"
 #include "util.h"
 
-spinlock slock = 0;
+spinlock slock = B_SPINLOCK_INITIALIZER;
 
 uint32 round_to_pagesize(uint32 size);
 
@@ -109,16 +109,15 @@ map_mem(void **log, phys_addr_t phy, size_t size, const char *name)
 
 	LOG(("mapping physical address %p with %#x bytes for %s\n",phy,size,name));
 
-	offset = phy & (B_PAGE_SIZE - 1);
+	offset = (uint32)phy & (B_PAGE_SIZE - 1);
 	phyadr = phy - offset;
 	size = round_to_pagesize(size + offset);
 	area = map_physical_memory(name, phyadr, size, B_ANY_KERNEL_ADDRESS,
 		0, &mapadr);
-	*log = (void*) ((uint32)mapadr + offset);
+	*log = mapadr + offset;
 
 	LOG(("physical = %p, logical = %p, offset = %#x, phyadr = %p, mapadr = %p, size = %#x, area = %#x\n",
 		phy, *log, offset, phyadr, mapadr, size, area));
 
 	return area;
 }
-