clk: keystone: sci-clk: check return value of kasprintf()

kasprintf() returns a pointer to dynamically allocated memory.
Pointer could be NULL in case allocation fails. Check pointer validity.
Identified with coccinelle (kmerr.cocci script).

Fixes: b745c07 ("clk: keystone: Add sci-clk driver support")
Depends-on: 96488c0 ("clk: keystone: sci-clk: cut down the clock name length")
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20230530093913.1656095-7-claudiu.beznea@microchip.com
Reviewed-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: claudiubeznea

drivers/clk/keystone/sci-clk.c

@@ -294,6 +294,8 @@ static int _sci_clk_build(struct sci_clk_provider *provider,
 
 	name = kasprintf(GFP_KERNEL, "clk:%d:%d", sci_clk->dev_id,
 			 sci_clk->clk_id);
+	if (!name)
+		return -ENOMEM;
 
 	init.name = name;