clk: stm32f4: fix an uninitialized variable

The variable s, used by pr_debug() to print the mnemonic of the modulation
depth in use, was not initialized. Fix the output by addressing the correct
mnemonic.

Fixes: 65b3516 ("clk: stm32f4: support spread spectrum clock generation")
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/r/77355eb9-19b3-46e5-a003-c21c0fae5bcd@stanley.mountain
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Link: https://lore.kernel.org/r/20250124111711.1051436-1-dario.binacchi@amarulasolutions.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: passgat

drivers/clk/clk-stm32f4.c

@@ -888,7 +888,6 @@ static int __init stm32f4_pll_ssc_parse_dt(struct device_node *np,
 					   struct stm32f4_pll_ssc *conf)
 {
 	int ret;
-	const char *s;
 
 	if (!conf)
 		return -EINVAL;
@@ -916,7 +915,8 @@ static int __init stm32f4_pll_ssc_parse_dt(struct device_node *np,
 	conf->mod_type = ret;
 
 	pr_debug("%pOF: SSCG settings: mod_freq: %d, mod_depth: %d mod_method: %s [%d]\n",
-		 np, conf->mod_freq, conf->mod_depth, s, conf->mod_type);
+		 np, conf->mod_freq, conf->mod_depth,
+		 stm32f4_ssc_mod_methods[ret], conf->mod_type);
 
 	return 0;
 }