[SDL_Tizen] Fix svace issue

[SDL_Tizen] Fix svace issue

- Uninitialized data is read from local variable 'sampleErrorY' at SDL_test_compare.c:106.
  The variable is uninitialized at SDL_test_compare.c:106.
- Buffer 'tempBuf' of size 4 accessed at SDL_test_fuzzer.c:259 can overflow.
  since its index 'return value of SDLTest_RandomUint8() % index' can have value 254 that is out of range,
  as indicated by preceding conditional expression at SDL_test_fuzzer.c:259.

Change-Id: Ia35aeea7f691bc582c40136c4269d70785e68000
Signed-off-by: huiyu.eun <huiyu.eun@samsung.com>