v2v: linux: Always match partition number in regexp.

Change the rex_device_p regular expression to always include a
partition number.

There should be no functional change here.

v2v/convert_linux.ml

@@ -1305,7 +1305,7 @@ let rec convert ~verbose ~keep_serial_console (g : G.guestfs) inspect source =
     and rex_device_cciss =
       Str.regexp "^/dev/\\(cciss/c[0-9]+d[0-9]+\\)$"
     and rex_device_p =
-      Str.regexp "^/dev/\\([a-z]+\\)\\([0-9]*\\)$"
+      Str.regexp "^/dev/\\([a-z]+\\)\\([0-9]+\\)$"
     and rex_device =
       Str.regexp "^/dev/\\([a-z]+\\)$" in