*: let libfmt quote strings

src/input/Init.cxx

@@ -55,16 +55,16 @@ input_stream_global_init(const ConfigData &config, EventLoop &event_loop)
 			input_plugins_enabled[i] = true;
 		} catch (const PluginUnconfigured &e) {
 			FmtDebug(input_domain,
-				 "Input plugin '{}' is not configured: {}",
+				 "Input plugin {:?} is not configured: {}",
 				 plugin->name, e.what());
 			continue;
 		} catch (const PluginUnavailable &e) {
 			FmtDebug(input_domain,
-				 "Input plugin '{}' is unavailable: {}",
+				 "Input plugin {:?} is unavailable: {}",
 				 plugin->name, e.what());
 			continue;
 		} catch (...) {
-			std::throw_with_nested(FmtRuntimeError("Failed to initialize input plugin '{}'",
+			std::throw_with_nested(FmtRuntimeError("Failed to initialize input plugin {:?}",
 							       plugin->name));
 		}
 	}

src/input/plugins/AlsaInputPlugin.cxx

@@ -256,13 +256,13 @@ AlsaInputStream::Recover(int err)
 	switch(err) {
 	case -EPIPE:
 		FmtDebug(alsa_input_domain,
-			 "Overrun on ALSA capture device \"{}\"",
+			 "Overrun on ALSA capture device {:?}",
 			 device);
 		break;
 
 	case -ESTRPIPE:
 		FmtDebug(alsa_input_domain,
-			 "ALSA capture device \"{}\" was suspended",
+			 "ALSA capture device {:?} was suspended",
 			 device);
 		break;
 	}

src/input/plugins/ArchiveInputPlugin.cxx

@@ -28,7 +28,7 @@ OpenArchiveInputStream(Path path, Mutex &mutex)
 		}
 	} catch (...) {
 		FmtDebug(input_domain,
-			 "not an archive, lookup '{}' failed: {}",
+			 "not an archive, lookup {:?} failed: {}",
 			 path, std::current_exception());
 		return nullptr;
 	}