sndio: Fix unnecessarily inefficient device enumeration.

mini_al.h

@@ -15398,7 +15398,10 @@ mal_result mal_context_enumerate_devices__sndio(mal_context* pContext, mal_enum_
         mal_itoa_s(iDevice, devpath+strlen(devpath), sizeof(devpath)-strlen(devpath), 10);
     
         struct stat st;
-        if (stat(devpath, &st) == 0) {
+        if (stat(devpath, &st) != 0) {
+            break;
+        }
+        
         // The device exists, but we need to check if it's usable as playback and/or capture. This is done
         // via the sndio API by using the "snd/N" format for the device name.
         char devid[256];
@@ -15444,7 +15447,6 @@ mal_result mal_context_enumerate_devices__sndio(mal_context* pContext, mal_enum_
             break;
         }
     }
-    }
     
     return MAL_SUCCESS;
 #else