drm: Remove DRM_ERR OS macro.

This was used to make all ioctl handlers return -errno on linux and errno on
*BSD.  Instead, just return -errno in shared code, and flip sign on return f
shared code to *BSD code.

Signed-off-by: Dave Airlie <airlied@linux.ie>
diff --git a/drivers/char/drm/sis_mm.c b/drivers/char/drm/sis_mm.c
index 441bbdb..244006a 100644
--- a/drivers/char/drm/sis_mm.c
+++ b/drivers/char/drm/sis_mm.c
@@ -140,7 +140,7 @@
 		      dev_priv->agp_initialized)) {
 		DRM_ERROR
 		    ("Attempt to allocate from uninitialized memory manager.\n");
-		return DRM_ERR(EINVAL);
+		return -EINVAL;
 	}
 
 	mem.size = (mem.size + SIS_MM_ALIGN_MASK) >> SIS_MM_ALIGN_SHIFT;
@@ -159,7 +159,7 @@
 		mem.offset = 0;
 		mem.size = 0;
 		mem.free = 0;
-		retval = DRM_ERR(ENOMEM);
+		retval = -ENOMEM;
 	}
 
 	DRM_COPY_TO_USER_IOCTL(argp, mem, sizeof(mem));