PSP: Fix `Wformat` warnings.

src/thread/psp/SDL_sysmutex.c

@@ -57,7 +57,7 @@ SDL_CreateMutex(void)
         );
 
         if (res < 0) {
-            SDL_SetError("Error trying to create mutex: %x", res);
+            SDL_SetError("Error trying to create mutex: %lx", res);
         }
     } else {
         SDL_OutOfMemory();
@@ -96,7 +96,7 @@ SDL_TryLockMutex(SDL_mutex * mutex)
             return SDL_MUTEX_TIMEDOUT;
             break;
         default:
-            return SDL_SetError("Error trying to lock mutex: %x", res);
+            return SDL_SetError("Error trying to lock mutex: %lx", res);
             break;
     }
 
@@ -119,7 +119,7 @@ SDL_mutexP(SDL_mutex * mutex)
 
     res = sceKernelLockLwMutex(&mutex->lock, 1, NULL);
     if (res != SCE_KERNEL_ERROR_OK) {
-        return SDL_SetError("Error trying to lock mutex: %x", res);
+        return SDL_SetError("Error trying to lock mutex: %lx", res);
     }
 
     return 0;
@@ -141,7 +141,7 @@ SDL_mutexV(SDL_mutex * mutex)
 
     res = sceKernelUnlockLwMutex(&mutex->lock, 1);
     if (res != 0) {
-        return SDL_SetError("Error trying to unlock mutex: %x", res);
+        return SDL_SetError("Error trying to unlock mutex: %lx", res);
     }
 
     return 0;

test/testgl2.c

@@ -302,7 +302,7 @@ main(int argc, char *argv[])
     }
 
     SDL_GetCurrentDisplayMode(0, &mode);
-    SDL_Log("Screen BPP    : %d\n", SDL_BITSPERPIXEL(mode.format));
+    SDL_Log("Screen BPP    : %" SDL_PRIu32 "\n", SDL_BITSPERPIXEL(mode.format));
     SDL_Log("Swap Interval : %d\n", SDL_GL_GetSwapInterval());
     SDL_GetWindowSize(state->windows[0], &dw, &dh);
     SDL_Log("Window Size   : %d,%d\n", dw, dh);