x86, microcode, AMD: Remove unneeded memset call

collect_cpu_info_amd() clears its csig arg but this is done in the
microcode_core's collect_cpu_info() by clearing the embedding struct
ucode_cpu_info. Drop it.
Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
Acked-by: Andreas Herrmann <Andreas.Herrmann3@amd.com>

arch/x86/kernel/microcode_amd.c

@@ -77,7 +77,6 @@ static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig)
 	struct cpuinfo_x86 *c = &cpu_data(cpu);
 	u32 dummy;
 
-	memset(csig, 0, sizeof(*csig));
 	if (c->x86_vendor != X86_VENDOR_AMD || c->x86 < 0x10) {
 		pr_warning("microcode: CPU%d: AMD CPU family 0x%x not "
 			   "supported\n", cpu, c->x86);