fw4: fix reading kernel version

Fix reading kernel version for kernels with revision 0 e.g. 6.12
Repair incorrect shift of the revision number causing incorrect value for > 255.

Signed-off-by: Mieczyslaw Nalewaj <namiltd@yahoo.com>

root/usr/share/ucode/fw4.uc

@@ -496,9 +496,9 @@ return {
 		    v = 0;
 
 		if (fd) {
-		    let m = match(fd.read("line"), /^Linux version ([0-9]+)\.([0-9]+)\.([0-9]+)/);
+		    let m = match(fd.read("line"), /^Linux version ([0-9]+)\.([0-9]+)(\.([0-9]+))?/);
 
-		    v = m ? (+m[1] << 24) | (+m[2] << 16) | (+m[3] << 8) : 0;
+		    v = m ? (+m[1] << 24) | (+m[2] << 16) | (+m[4]) : 0;
 		    fd.close();
 		}