ReadMe: update some typo

src/Makefile

@@ -23,7 +23,7 @@ ifndef CFLAGS
  ifdef DEBUG
   CFLAGS = -g
  else
-  CFLAGS = -O2 -g 
+  CFLAGS = -O2
  endif
 CFLAGS +=-Wall -Wstrict-prototypes -fno-omit-frame-pointer -Wstrict-aliasing -funwind-tables -Wmissing-prototypes -Wshadow -Wextra -Wno-unused-parameter -Wno-implicit-fallthrough
 endif

src/fast_ping.c

@@ -329,6 +329,10 @@ static struct addrinfo *_fast_ping_getaddr(const char *host, const char *port, i
 	struct addrinfo hints;
 	struct addrinfo *result = NULL;
 	int errcode = 0;
+	
+	if (host == NULL || port == NULL) {
+		goto errout;
+	}
 
 	memset(&hints, 0, sizeof(hints));
 	hints.ai_family = AF_UNSPEC;