clk: tegra: clk-tegra30: Remove unused variable 'reg'

Fixes the following W=1 kernel build warning(s):

 drivers/clk/tegra/clk-tegra30.c: In function ‘tegra30_enable_cpu_clock’:
 drivers/clk/tegra/clk-tegra30.c:1107:15: warning: variable ‘reg’ set but not used [-Wunused-but-set-variable]

Cc: Peter De Schrijver <pdeschrijver@nvidia.com>
Cc: Prashant Gaikwad <pgaikwad@nvidia.com>
Cc: Michael Turquette <mturquette@baylibre.com>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Jonathan Hunter <jonathanh@nvidia.com>
Cc: linux-clk@vger.kernel.org
Cc: linux-tegra@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20210126124540.3320214-8-lee.jones@linaro.orgSigned-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/tegra/clk-tegra30.c

@@ -1104,12 +1104,9 @@ static void tegra30_cpu_out_of_reset(u32 cpu)
 
 static void tegra30_enable_cpu_clock(u32 cpu)
 {
-	unsigned int reg;
-
 	writel(CPU_CLOCK(cpu),
 	       clk_base + TEGRA30_CLK_RST_CONTROLLER_CLK_CPU_CMPLX_CLR);
-	reg = readl(clk_base +
-		    TEGRA30_CLK_RST_CONTROLLER_CLK_CPU_CMPLX_CLR);
+	readl(clk_base + TEGRA30_CLK_RST_CONTROLLER_CLK_CPU_CMPLX_CLR);
 }
 
 static void tegra30_disable_cpu_clock(u32 cpu)