nios2: Replace strcpy() with strscpy() and simplify setup_cpuinfo()

strcpy() is deprecated; use strscpy() instead.

Since the destination buffer has a fixed length, strscpy() automatically
determines its size using sizeof() when the size argument is omitted.
This makes the explicit size argument unnecessary - remove it.

Now, combine both if-else branches using strscpy() and the same buffer
into a single statement to simplify the code.

No functional changes intended.

Link: KSPP#88
Cc: linux-hardening@vger.kernel.org
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Reviewed-by: Kees Cook <kees@kernel.org>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>

Author: toblux

arch/nios2/kernel/cpuinfo.c

@@ -46,10 +46,7 @@ void __init setup_cpuinfo(void)
 	cpuinfo.cpu_clock_freq = fcpu(cpu, "clock-frequency");
 
 	str = of_get_property(cpu, "altr,implementation", &len);
-	if (str)
-		strscpy(cpuinfo.cpu_impl, str, sizeof(cpuinfo.cpu_impl));
-	else
-		strcpy(cpuinfo.cpu_impl, "<unknown>");
+	strscpy(cpuinfo.cpu_impl, str ?: "<unknown>");
 
 	cpuinfo.has_div = of_property_read_bool(cpu, "altr,has-div");
 	cpuinfo.has_mul = of_property_read_bool(cpu, "altr,has-mul");