Bug 653 bugfix

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%403442

src/video/win32/SDL_win32mouse.c

@@ -85,7 +85,7 @@ WIN_InitMouse(_THIS)
             continue;
         }
         buffer = SDL_malloc((tmp + 1) * sizeof(char));
-        key_name = SDL_malloc(tmp + sizeof(reg_key_root) * sizeof(char));
+        key_name = SDL_malloc((tmp + SDL_strlen(reg_key_root) + 1) * sizeof(char));
 
         /* we're getting the device registry path and polishing it to get it's name,
            surely there must be an easier way, but we haven't found it yet */
@@ -125,6 +125,9 @@ WIN_InitMouse(_THIS)
                 }
             }
         }
+
+		buffer -= 4;
+
         if (is_rdp == 1) {
             SDL_free(buffer);
             SDL_free(key_name);