kvm tools: Fix type mismatches on GCC 4.4 on 32-bit systems

The tools/kvm build still fails on 32-bit:

 cc1: warnings being treated as errors
 qcow.c: In function ‘qcow1_write_sector’:
 qcow.c:307: error: comparison between signed and unsigned integer expressions
 make: *** [qcow.o] Error 1
 make: *** Waiting for unfinished jobs....

using:

 gcc version 4.4.4 20100630 (Red Hat 4.4.4-10) (GCC)

The patch below addresses them.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

kvm.c

@@ -162,7 +162,7 @@ static void kvm_register_mem_slot(struct kvm *kvm, u32 slot, u64 guest_phys, u64
 		.slot			= slot,
 		.guest_phys_addr	= guest_phys,
 		.memory_size		= size,
-		.userspace_addr		= (u64)userspace_addr,
+		.userspace_addr		= (unsigned long)userspace_addr,
 	};
 
 	ret = ioctl(kvm->vm_fd, KVM_SET_USER_MEMORY_REGION, &mem);

qcow.c

@@ -295,7 +295,7 @@ static int qcow1_write_sector(struct disk_image *disk, u64 sector, void *src, u3
 {
 	struct qcow *q = disk->priv;
 	struct qcow_header *header = q->header;
-	ssize_t nr_written;
+	u32 nr_written;
 	char *buf;
 	u64 offset;
 	ssize_t nr;