powerpc/44x: Fix ocm_block allocation

Allocate enough memory for the ocm_block structure, not just a pointer
to it.

Signed-off-by: Ilia Mirkin <[e-mail]>
Signed-off-by: Benjamin Herrenschmidt <[e-mail]>

arch/powerpc/sysdev/ppc4xx_ocm.c

···
 		if (IS_ERR_VALUE(offset))
 			continue;
 
-		ocm_blk = kzalloc(sizeof(struct ocm_block *), GFP_KERNEL);
+		ocm_blk = kzalloc(sizeof(struct ocm_block), GFP_KERNEL);
 		if (!ocm_blk) {
 			printk(KERN_ERR "PPC4XX OCM: could not allocate ocm block");
 			rh_free(ocm_reg->rh, offset);