Fixed category in check_argument function

{
"category": "windows", 
"status": false, 
"return": "0x00000000", 
"timestamp": "2013-05-15 21:36:32,491", 
"thread_id": "1400", 
"repeated": 0, 
"api": "FindWindowA", 
"arguments": [
 {
   "name": "ClassName", 
   "value": "OLLYDBG"
 }, 
 {
   "name": "WindowName", 
   "value": ""
 }
]
}
Additional indicators

"category": "windows", 
"api": "FindWindowA", 
...
"arguments": [
	{"name": "ClassName","value": "GBDYLLO"}, 
	{"name": "ClassName","value": "pediy06"}, 
	{"name": "ClassName","value": "FilemonClass"}, 
	{"name": "WindowName","value": "File Monitor - Sysinternals: www.sysinternals.com"}
	{"name": "ClassName","value": "PROCMON_WINDOW_CLASS"}, 
	{"name": "WindowName","value": "Process Monitor - Sysinternals: www.sysinternals.com"}
]
Merge pull request #22 from paramduggal/patch-1

Fixed category in check_argument function