Clean up warnings in the malloc_debug_* files.

Also clean up cpplint.py-detected lint.

Change-Id: Ia18e89c4c6878764f8d7ed34b8247e7a8d8fe88b
diff --git a/libc/bionic/malloc_debug_check_mapinfo.h b/libc/bionic/malloc_debug_check_mapinfo.h
index 8a01cd3..e19f71e 100644
--- a/libc/bionic/malloc_debug_check_mapinfo.h
+++ b/libc/bionic/malloc_debug_check_mapinfo.h
@@ -31,16 +31,16 @@
 
 #include <sys/cdefs.h>
 
-typedef struct mapinfo {
-    struct mapinfo *next;
-    unsigned start;
-    unsigned end;
-    char name[];
-} mapinfo;
+struct mapinfo {
+  struct mapinfo* next;
+  unsigned start;
+  unsigned end;
+  char name[];
+};
 
 __LIBC_HIDDEN__ mapinfo *init_mapinfo(int pid);
 __LIBC_HIDDEN__ void deinit_mapinfo(mapinfo *mi);
 __LIBC_HIDDEN__ const char *map_to_name(mapinfo *mi, unsigned pc, const char* def);
 __LIBC_HIDDEN__ const mapinfo *pc_to_mapinfo(mapinfo *mi, unsigned pc, unsigned *rel_pc);
 
-#endif/*MALLOC_DEBUG_CHECK_MAPINFO_H*/
+#endif /*MALLOC_DEBUG_CHECK_MAPINFO_H*/