drivers/gpu: Use kzalloc for allocating only one thing

Use kzalloc rather than kcalloc(1,...)

The use of the allocated memory that looks like an array is &p->relocs[0],
but this should be the same as p->relocs.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
@@

- kcalloc(1,
+ kzalloc(
          ...)
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/radeon/r600_cs.c

@@ -170,7 +170,7 @@ static int r600_cs_packet_next_reloc_nomm(struct radeon_cs_parser *p,
 			  idx, relocs_chunk->length_dw);
 		return -EINVAL;
 	}
-	*cs_reloc = &p->relocs[0];
+	*cs_reloc = p->relocs;
 	(*cs_reloc)->lobj.gpu_offset = (u64)relocs_chunk->kdata[idx + 3] << 32;
 	(*cs_reloc)->lobj.gpu_offset |= relocs_chunk->kdata[idx + 0];
 	return 0;
@@ -717,7 +717,7 @@ static int r600_cs_parser_relocs_legacy(struct radeon_cs_parser *p)
 	if (p->chunk_relocs_idx == -1) {
 		return 0;
 	}
-	p->relocs = kcalloc(1, sizeof(struct radeon_cs_reloc), GFP_KERNEL);
+	p->relocs = kzalloc(sizeof(struct radeon_cs_reloc), GFP_KERNEL);
 	if (p->relocs == NULL) {
 		return -ENOMEM;
 	}