x86, microcode, AMD: Exit early on success

Once we've found and validated the ucode patch for the current CPU,
there's no need to iterate over the remaining patches in the binary
image. Exit then and save us a bunch of cycles.
Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>

arch/x86/kernel/microcode_amd.c

@@ -282,27 +282,23 @@ generic_load_microcode(int cpu, const u8 *data, size_t size)
 			mc_hdr  = patch;
 			new_mc  = patch;
 			new_rev = mc_hdr->patch_id;
-			leftover -= mc_size;
-		} else {
+			goto out_ok;
+		}
+
 		ucode_ptr += current_size;
 		leftover  -= current_size;
 	}
-	}
 
 	if (!new_mc) {
 		state = UCODE_NFOUND;
 		goto free_table;
 	}
 
-	if (!leftover) {
+out_ok:
 	uci->mc = new_mc;
 	state = UCODE_OK;
 	pr_debug("CPU%d update ucode (0x%08x -> 0x%08x)\n",
 		 cpu, uci->cpu_sig.rev, new_rev);
-	} else {
-		new_mc = NULL;
-		state = UCODE_ERROR;
-	}
 
 free_table:
 	free_equiv_cpu_table();