Fixes rtlsdrblog#8. Add rtl_biast message to beginning of output so t…

…hat it's clear

what is generating further logs when journalled with other output.

src/rtl_biast.c

@@ -102,6 +102,8 @@ int main(int argc, char **argv)
 		}
 	}
 
+	printf("rtl_biast\n");
+
 	if (!dev_given) {
 		dev_index = verbose_device_search("0");
 	}