Merge pull request #2000 from dgquintas/extern-c-braces

Added braces to "extern C".

include/grpc/support/tls_pthread.h

@@ -49,10 +49,13 @@ struct gpr_pthread_thread_local {
 
 #define gpr_tls_init(tls) GPR_ASSERT(0 == pthread_key_create(&(tls)->key, NULL))
 #define gpr_tls_destroy(tls) pthread_key_delete((tls)->key)
+#define gpr_tls_get(tls) ((gpr_intptr)pthread_getspecific((tls)->key))
 #ifdef __cplusplus
-extern "C"
+extern "C" {
 #endif
 gpr_intptr gpr_tls_set(struct gpr_pthread_thread_local *tls, gpr_intptr value);
-#define gpr_tls_get(tls) ((gpr_intptr)pthread_getspecific((tls)->key))
+#ifdef __cplusplus
+}
+#endif
 
 #endif