Update to build on Xcode 6.0: variable (result) can be unitialized if...

Update to build on Xcode 6.0: variable (result) can be unitialized if condition is false (TAKE 2) [-Wsometimes-uninitialized]

indra/llvfs/llvfs_objc.mm

@@ -48,7 +48,7 @@ std::string* findSystemDirectory(NSSearchPathDirectory searchPathDirectory,
 {
     NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
     
-    std::string *result="";
+    std::string *result = nil;
     NSString *path = nil;
     
     // Search for the path