Fix x86_64 boot/memory.c compilation (a misprint)

There is a misprint in arch/i386/boot/memory.c file that leads to error in x86_64 compilation:

...
CC arch/x86_64/boot/memory.o
arch/i386/boot/memory.c: In function `detect_memory':
arch/i386/boot/memory.c:32: error: can't find a register in class DREG' while reloading asm'

The err variable is specified in asm output list like "=dm", not "=m".

This is for 2.6.22-rc1-mm1 tree. Maybe this exists in i386 as well and the patch is sent, but...

---

index 8a82aa9..7ae2d23 100644
@@ -30,7 +30,7 @@ static int detect_memory_e820(void)
 		size = sizeof(struct e820entry);
 		id = SMAP;
 		asm("int $0x15; setc %0"
-		    : "=dm" (err), "+b" (next), "+d" (id), "+c" (size),
+		    : "=m" (err), "+b" (next), "+d" (id), "+c" (size),
 		      "=m" (*desc)
 		    : "D" (desc), "a" (0xe820));