[patch] fix nonsense errno code in os_linux.cpp

I noticed strange code in os_linux.cpp, like this:

+    if (ioctl(get_fd(), HDIO_DRIVE_TASKFILE, task)) {
+      if (errno==-EINVAL)

I don't think this can work as expected (fortunately, it seems it is only in
obsolete /dev/hda support, and only used for generating "user-friendly"
message on error path). Patch attached.

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Index: os_linux.cpp
===================================================================
--- os_linux.cpp	(revision 4292)
+++ os_linux.cpp	(working copy)
@@ -380,7 +380,7 @@
     memcpy(task+sizeof(ide_task_request_t), data, 512);
 
     if (ioctl(get_fd(), HDIO_DRIVE_TASKFILE, task)) {
-      if (errno==-EINVAL)
+      if (errno==EINVAL)
         pout("Kernel lacks HDIO_DRIVE_TASKFILE support; compile kernel with CONFIG_IDE_TASKFILE_IO set\n");
       return -1;
     }
@@ -406,7 +406,7 @@
     buff[5]=normal_hi;
 
     if (ioctl(get_fd(), HDIO_DRIVE_TASK, buff)) {
-      if (errno==-EINVAL) {
+      if (errno==EINVAL) {
         pout("Error SMART Status command via HDIO_DRIVE_TASK failed");
         pout("Rebuild older linux 2.2 kernels with HDIO_DRIVE_TASK support added\n");
       }