Fix incorrect strcasecmp usage.

[Mike McCormack]

ChangeLog:
* Fix incorrect strcasecmp usage.
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Index: dlls/winmm/mci.c
===================================================================
RCS file: /home/wine/wine/dlls/winmm/mci.c,v
retrieving revision 1.42
diff -u -r1.42 mci.c
--- dlls/winmm/mci.c	30 Apr 2003 17:28:45 -0000	1.42
+++ dlls/winmm/mci.c	17 Jul 2003 18:46:03 -0000
@@ -512,7 +512,7 @@
 	/* silence warning if all is used... some bogus program use commands like
 	 * 'open all'...
 	 */
-	if (strcasecmp(strDevTyp, "all") != 0) {
+	if (strcasecmp(strDevTyp, "all") == 0) {
 	    dwRet = MCIERR_CANNOT_USE_ALL;
 	} else {
 	    FIXME("Couldn't load driver for type %s.\n"