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51f75b8b30
strchr and strrchr return a pointer to the first/last occurrence of a character in a string, or NULL if the character is not found. According to the C standard, the final null terminator is part of the string, and it should thus be possible to get a pointer to the final null with these functions. The fallback implementations of SDL_strchr and SDL_strrchr would always return NULL if trying to find '\0', and this commit fixes that.