Clang-Tidy fixes (#6725)

(cherry picked from commit 3c501b963d)

test/testcustomcursor.c

@@ -102,7 +102,8 @@ init_system_cursor(const char *image[])
     int i, row, col;
     Uint8 data[4 * 32];
     Uint8 mask[4 * 32];
-    int hot_x, hot_y;
+    int hot_x = 0;
+    int hot_y = 0;
 
     i = -1;
     for (row = 0; row < 32; ++row) {
@@ -127,7 +128,7 @@ init_system_cursor(const char *image[])
             }
         }
     }
-    SDL_sscanf(image[4 + row], "%d,%d", &hot_x, &hot_y);
+    (void)SDL_sscanf(image[4 + row], "%d,%d", &hot_x, &hot_y);
     return SDL_CreateCursor(data, mask, 32, 32, hot_x, hot_y);
 }