soc: qcom: smem: return proper type for cached entry functions

What phdr_to_last_uncached_entry() returns is the address of the
start of the free space following all allocated uncached entries.
It really doesn't refer to an actual (initialized) private entry
structure.   Similarly phdr_to_last_cached_entry() returns the
address of the end of free space, preceding the last allocated cache
entry.  Change both functions' return type to be pointer to void
to reflect this.

Meanwhile, phdr_to_first_cached_entry() really *does* point to a
private entry structure, so change its return type to reflect
this fact.

Signed-off-by: Alex Elder <elder@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>

drivers/soc/qcom/smem.c

@@ -280,15 +280,16 @@ struct qcom_smem {
 	struct smem_region regions[0];
 };
 
-static struct smem_private_entry *
+static void *
 phdr_to_last_uncached_entry(struct smem_partition_header *phdr)
 {
 	void *p = phdr;
 
 	return p + le32_to_cpu(phdr->offset_free_uncached);
 }
 
-static void *phdr_to_first_cached_entry(struct smem_partition_header *phdr,
+static struct smem_private_entry *
+phdr_to_first_cached_entry(struct smem_partition_header *phdr,
 					size_t cacheline)
 {
 	void *p = phdr;
@@ -297,7 +298,8 @@ static void *phdr_to_first_cached_entry(struct smem_partition_header *phdr,
 	return p + le32_to_cpu(phdr->size) - ALIGN(sizeof(*e), cacheline);
 }
 
-static void *phdr_to_last_cached_entry(struct smem_partition_header *phdr)
+static void *
+phdr_to_last_cached_entry(struct smem_partition_header *phdr)
 {
 	void *p = phdr;