[WINMM] fix lolvldrv.c memory leak

[Robert Reif]

Fix memory leak when there are too many drivers.

Found by smatch.
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Index: dlls/winmm/lolvldrv.c
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RCS file: /home/wine/wine/dlls/winmm/lolvldrv.c,v
retrieving revision 1.63
diff -u -p -r1.63 lolvldrv.c
--- dlls/winmm/lolvldrv.c	17 Dec 2004 19:04:28 -0000	1.63
+++ dlls/winmm/lolvldrv.c	15 Mar 2005 04:06:40 -0000
@@ -309,6 +309,7 @@ LPWINE_MLD	MMDRV_Alloc(UINT size, UINT t
     if (i == MAX_MM_MLDRVS) {
 	/* the MM_MLDrvs table could be made growable in the future if needed */
 	ERR("Too many open drivers\n");
+        HeapFree(GetProcessHeap(), 0, mld);
 	return NULL;
     }
     MM_MLDrvs[i] = mld;