mcicda: Sign-compare warning fix

[Andrew Talbot]

Changelog:
    mcicda: Sign-compare warning fix.

diff --git a/dlls/mcicda/mcicda.c b/dlls/mcicda/mcicda.c
index 6e4a835..2edb919 100644
--- a/dlls/mcicda/mcicda.c
+++ b/dlls/mcicda/mcicda.c
@@ -270,7 +270,7 @@ static DWORD MCICDA_Open(UINT wDevID, DWORD dwFlags, LPMCI_OPEN_PARMSW lpOpenPar
     DWORD               ret = MCIERR_HARDWARE;
     WINE_MCICDAUDIO* 	wmcda = (WINE_MCICDAUDIO*)mciGetDriverData(wDevID);
     WCHAR               root[7], drive = 0;
-    int                 count;
+    unsigned int        count;
 
     TRACE("(%04X, %08X, %p);\n", wDevID, dwFlags, lpOpenParms);