Remove '\n' from _MSG() format strings

The (armsoc-specific) {DEBUG,INFO,ERROR,WARNING}_MSG() macros always
append '\n' to their string format argument.

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>

BUG=chromium-os:38551
TEST=sanity check on device:
TEST=See steps in crosbug.com/38551
  /var/log/xorg/Xorg.0.log.old should have a message like this, but it is
   no longer followed by a blank log entry (except for a timestamp).
 [ 71223.362] (EE) ARMSOC(0): ERROR: Cannot get DRM master: Invalid argument

Change-Id: Ic54a7cce138bc88fe0e16a7b77c660522595a504
Reviewed-on: https://gerrit.chromium.org/gerrit/42603
Commit-Queue: Daniel Kurtz <djkurtz@chromium.org>
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
Tested-by: Daniel Kurtz <djkurtz@chromium.org>
diff --git a/src/omap_driver.c b/src/omap_driver.c
index 582f349..e0e6074 100644
--- a/src/omap_driver.c
+++ b/src/omap_driver.c
@@ -995,7 +995,7 @@
 
 	ret = drmSetMaster(pOMAP->drmFD);
 	if (ret) {
-		ERROR_MSG("Cannot get DRM master: %s\n", strerror(errno));
+		ERROR_MSG("Cannot get DRM master: %s", strerror(errno));
 		return FALSE;
 	}
 
@@ -1038,7 +1038,7 @@
 
 	ret = drmDropMaster(pOMAP->drmFD);
 	if (ret) {
-		WARNING_MSG("drmDropMaster failed: %s\n", strerror(errno));
+		WARNING_MSG("drmDropMaster failed: %s", strerror(errno));
 	}
 
 	TRACE_EXIT();