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The operator "!" means the same as == 0.
Look here:

PHP код:

if(strcmp(DOF2_GetString(pFile(playerid),"Clan"), "None") == 0) return SetPlayerColor(playerid,C_WHITE);// with == 0
if(!strcmp(DOF2_GetString(pFile(playerid),"Clan"), "Accuracy")) return SetPlayerColor(playerid,C_A);// with the operator "!" 


There are both options.

EDIT:
If strcmp return 0, the both strings are equal.
Both strings aren't equal, if strcmp return 1.