libroot/os/driver_settings.cpp: fix memory leak

Fix leakage of memory allocated to 'text' when new_settings() fails
in load_driver_settings() at line 767.

Pointed out by Clang Static Analyzer.

Change-Id: I5888e2377c4da63040d5a66199f04aebd2034728
Reviewed-on: https://review.haiku-os.org/c/haiku/+/6382
Tested-by: Commit checker robot <[email protected]>
Reviewed-by: Jérôme Duval <[email protected]>

src/system/libroot/os/driver_settings.cpp

@@ -764,7 +764,10 @@ load_driver_settings(const char *driverName)
 					return NULL;
 
 				memcpy(text, settings->buffer, settings->size + 1);
-				return new_settings(text, driverName);
+				settings_handle *handle =  new_settings(text, driverName);
+				if (handle == NULL)
+					free(text);
+				return handle;
 			}
 			settings = settings->next;
 		}