tree-wide: get rid of lgtm annotations

We now use CodeQL, and LGTM itself is gone. Those old annotations are not
useful for anythign now.

src/basic/errno-util.h

@@ -75,7 +75,7 @@ static inline int RET_NERRNO(int ret) {
 
 static inline const char *strerror_safe(int error) {
         /* 'safe' here does NOT mean thread safety. */
-        return strerror(abs(error)); /* lgtm [cpp/potentially-dangerous-function] */
+        return strerror(abs(error));
 }
 
 static inline int errno_or_else(int fallback) {

src/basic/in-addr-util.c

@@ -66,7 +66,7 @@ bool in4_addr_is_link_local_dynamic(const struct in_addr *a) {
 bool in6_addr_is_link_local(const struct in6_addr *a) {
         assert(a);
 
-        return IN6_IS_ADDR_LINKLOCAL(a); /* lgtm [cpp/potentially-dangerous-function] */
+        return IN6_IS_ADDR_LINKLOCAL(a);
 }
 
 int in_addr_is_link_local(int family, const union in_addr_union *u) {
@@ -131,7 +131,7 @@ int in_addr_is_localhost(int family, const union in_addr_union *u) {
                 return in4_addr_is_localhost(&u->in);
 
         if (family == AF_INET6)
-                return IN6_IS_ADDR_LOOPBACK(&u->in6); /* lgtm [cpp/potentially-dangerous-function] */
+                return IN6_IS_ADDR_LOOPBACK(&u->in6);
 
         return -EAFNOSUPPORT;
 }
@@ -144,7 +144,7 @@ int in_addr_is_localhost_one(int family, const union in_addr_union *u) {
                 return be32toh(u->in.s_addr) == UINT32_C(0x7F000001);
 
         if (family == AF_INET6)
-                return IN6_IS_ADDR_LOOPBACK(&u->in6); /* lgtm [cpp/potentially-dangerous-function] */
+                return IN6_IS_ADDR_LOOPBACK(&u->in6);
 
         return -EAFNOSUPPORT;
 }