clk: xgene: Remove return from void function

This function doesn't return anything because it's void. Drop the
return statement.

Cc: Loc Ho <lho@apm.com>
Signed-off-by: NStephen Boyd <sboyd@codeaurora.org>

drivers/clk/clk-xgene.c

@@ -50,7 +50,7 @@ static inline u32 xgene_clk_read(void __iomem *csr)
 
 static inline void xgene_clk_write(u32 data, void __iomem *csr)
 {
-	return writel_relaxed(data, csr);
+	writel_relaxed(data, csr);
 }
 
 /* PLL Clock */