pcsx2: init some variables

Avoid gcc warning

pcsx2/R5900.cpp

@@ -113,7 +113,7 @@ void cpuShutdown()
 __ri void cpuException(u32 code, u32 bd)
 {
 	bool errLevel2, checkStatus;
-	u32 offset;
+	u32 offset = 0;
 
     cpuRegs.branch = 0;		// Tells the interpreter that an exception occurred during a branch.
 	cpuRegs.CP0.n.Cause = code & 0xffff;

pcsx2/ps2/BiosTools.cpp

@@ -190,7 +190,7 @@ template< size_t _size >
 static void LoadExtraRom( const wxChar* ext, u8 (&dest)[_size] )
 {
 	wxString Bios1;
-	s64 filesize;
+	s64 filesize = 0;
 
 	// Try first a basic extension concatenation (normally results in something like name.bin.rom1)
 	const wxString Bios( g_Conf->FullpathToBios() );