Fix build for debug mode (warning as error)

Local variable type was changed from int to unsigned int
due incompatible type warning

Signed-off-by: Dmitry Brazhkin <dmitry.brazhkin@intel.com>

omx_utils/src/mfx_omx_debug.cpp

@@ -61,7 +61,7 @@ static bool is_matched(const char* str)
     if (0 == MFX_OMX_GET_ARRAY_SIZE(g_debug_pattern)) return true; // match all
     if (!str) return false;
 
-    for (int i=0; i < MFX_OMX_GET_ARRAY_SIZE(g_debug_pattern); ++i)
+    for (unsigned int i=0; i < MFX_OMX_GET_ARRAY_SIZE(g_debug_pattern); ++i)
     {
         if (strstr(str, g_debug_pattern[i])) return true;
     }