msi: Replaced msi_free() by LocalAlloc() since ConvertSidToStringSidW uses LocalAlloc().

Spotted by Christoph von Wittich <Christoph@ApiViewer.de>.
diff --git a/dlls/msi/registry.c b/dlls/msi/registry.c
index bf06d9d..ac89186 100644
--- a/dlls/msi/registry.c
+++ b/dlls/msi/registry.c
@@ -662,7 +662,7 @@
     else
         rc = RegOpenKeyW(HKEY_LOCAL_MACHINE, keypath, key);
 
-    msi_free(usersid);
+    LocalFree(usersid);
     return rc;
 }
 
@@ -739,7 +739,7 @@
     else
         rc = RegOpenKeyW(HKEY_LOCAL_MACHINE, keypath, key);
 
-    msi_free(usersid);
+    LocalFree(usersid);
     return rc;
 }
 
@@ -764,7 +764,7 @@
 
     sprintfW(keypath, szUserDataComp_fmt, usersid, comp);
 
-    msi_free(usersid);
+    LocalFree(usersid);
     return RegDeleteTreeW(HKEY_LOCAL_MACHINE, keypath);
 }
 
@@ -794,7 +794,7 @@
     else
         rc = RegOpenKeyW(HKEY_LOCAL_MACHINE, keypath, key);
 
-    msi_free(usersid);
+    LocalFree(usersid);
     return rc;
 }
 
@@ -824,7 +824,7 @@
     else
         rc = RegOpenKeyW(HKEY_LOCAL_MACHINE, keypath, key);
 
-    msi_free(usersid);
+    LocalFree(usersid);
     return rc;
 }
 
@@ -849,7 +849,7 @@
 
     sprintfW(keypath, szUserDataProd_fmt, usersid, squished_pc);
 
-    msi_free(usersid);
+    LocalFree(usersid);
     return RegDeleteTreeW(HKEY_LOCAL_MACHINE, keypath);
 }
 
@@ -1039,7 +1039,7 @@
     }
 
     sprintfW(keypath, szInstaller_LocalManagedProd_fmt, usersid, squished_pc);
-    msi_free(usersid);
+    LocalFree(usersid);
 
     if (create)
         return RegCreateKeyW(HKEY_LOCAL_MACHINE, keypath, key);