Switch to g_ for globals.

That's what the Google style guide recommends, and we're starting
to get a mix.

Change-Id: Ib0c53a890bb5deed5c679e887541a715faea91fc
diff --git a/libc/bionic/libc_init_common.cpp b/libc/bionic/libc_init_common.cpp
index 1cfaf50..abf2d36 100644
--- a/libc/bionic/libc_init_common.cpp
+++ b/libc/bionic/libc_init_common.cpp
@@ -77,7 +77,7 @@
  * apply to linker-private copies and will not be visible from libc later on.
  *
  * Note: this function creates a pthread_internal_t for the initial thread and
- * stores the pointer in TLS, but does not add it to pthread's gThreadList. This
+ * stores the pointer in TLS, but does not add it to pthread's thread list. This
  * has to be done later from libc itself (see __libc_init_common).
  *
  * This function also stores a pointer to the kernel argument block in a TLS slot to be