testsurround: fix channel names

Used table in include/SDL3/SDL_audio.h as reference.

(cherry picked from commit e1b8a032391f4b24453d5bcbe725a35b3894ea5d)

include/SDL_audio.h

@@ -169,13 +169,13 @@ typedef void (SDLCALL * SDL_AudioCallback) (void *userdata, Uint8 * stream,
  *  The calculated values in this structure are calculated by SDL_OpenAudio().
  *
  *  For multi-channel audio, the default SDL channel mapping is:
- *  2:  FL FR                       (stereo)
- *  3:  FL FR LFE                   (2.1 surround)
- *  4:  FL FR BL BR                 (quad)
- *  5:  FL FR LFE BL BR             (4.1 surround)
- *  6:  FL FR FC LFE SL SR          (5.1 surround - last two can also be BL BR)
- *  7:  FL FR FC LFE BC SL SR       (6.1 surround)
- *  8:  FL FR FC LFE BL BR SL SR    (7.1 surround)
+ *  2:  FL  FR                          (stereo)
+ *  3:  FL  FR LFE                      (2.1 surround)
+ *  4:  FL  FR  BL  BR                  (quad)
+ *  5:  FL  FR LFE  BL  BR              (4.1 surround)
+ *  6:  FL  FR  FC LFE  SL  SR          (5.1 surround - last two can also be BL BR)
+ *  7:  FL  FR  FC LFE  BC  SL  SR      (6.1 surround)
+ *  8:  FL  FR  FC LFE  BL  BR  SL  SR  (7.1 surround)
  */
 typedef struct SDL_AudioSpec
 {

test/testsurround.c

@@ -38,6 +38,7 @@ get_channel_name(int channel_index, int channel_count)
     case 2:
         switch (channel_count) {
         case 3:
+        case 5:
             return "Low Frequency Effects";
         case 4:
             return "Back Left";
@@ -57,27 +58,32 @@ get_channel_name(int channel_index, int channel_count)
         switch (channel_count) {
         case 5:
             return "Back Right";
+        case 6:
+            return "Side Left";
         case 7:
             return "Back Center";
-        case 6:
         case 8:
             return "Back Left";
         }
+        SDL_assert(0);
     case 5:
         switch (channel_count) {
-        case 7:
-            return "Back Left";
         case 6:
+            return "Side Right";
+        case 7:
+            return "Side Left";
         case 8:
             return "Back Right";
         }
+        SDL_assert(0);
     case 6:
         switch (channel_count) {
         case 7:
-            return "Back Right";
+            return "Side Right";
         case 8:
             return "Side Left";
         }
+        SDL_assert(0);
     case 7:
         return "Side Right";
     }