PC_Serial and USB_Serial: Fix -Wformat-security

Change-Id: Ia150eaf0e639c03b3d1f267d9ee582ff82bf0d21
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4442
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>

src/add-ons/kernel/drivers/ports/pc_serial/Tracing.cpp

@@ -95,7 +95,7 @@ pc_serial_trace(bool force, const char *format, ...)
 		close(fd);
 		release_sem(sLogLock);
 	} else
-		dprintf(buffer);
+		dprintf("%s", buffer);
 }
 
 

src/add-ons/kernel/drivers/ports/usb_serial/Tracing.cpp

@@ -98,7 +98,7 @@ usb_serial_trace(bool force, const char *format, ...)
 		close(fd);
 		release_sem(sLogLock);
 	} else
-		dprintf(buffer);
+		dprintf("%s", buffer);
 }