Add a newline to log messages at macro expansion

This simplifies building the log output because it means we don't have
to malloc a buffer to append a newline, and we keep the atomic write
property we're after.  It also takes advantage of the C constant string
concatenation which we already require to work to prepend the thread and
pid data.

src/util.c

@@ -40,32 +40,18 @@ void exit_err( const char *msg )
 }
 
 
-
 void mylog(int line_level, const char* format, ...)
 {
-	va_list argptr;
-	char * format_n = NULL;
-	int format_len;
-
-	
 	if (line_level < log_level) { return; }
-	
-	/* Copy the format sideways so that we can append a "\n" to it
-	 * and avoid a second fprintf. This stops log lines from getting
-	 * interleaved.
-	 */
-	format_len = strlen( format );
-	format_n = xmalloc( format_len + 2 );
-	memcpy( format_n, format, format_len+1 );
-	format_n[format_len] = '\n';
+
+	va_list argptr;
 
 	va_start(argptr, format);
-	vfprintf(stderr, format_n, argptr);
+	vfprintf(stderr, format, argptr);
 	va_end(argptr);
-
-	free( format_n );
 }
 
+
 void* xrealloc(void* ptr, size_t size)
 {
 	void* p = realloc(ptr, size);