bpf: Add missing newline characters in verifier error messages

Newline characters are added in two verifier error messages,
refactored in Commit afbf21dc ("bpf: Support readonly/readwrite
buffers in verifier"). This way, they do not mix with
messages afterwards.
Signed-off-by: NYonghong Song <yhs@fb.com>
Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
Acked-by: NSong Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20200728221801.1090349-1-yhs@fb.com

kernel/bpf/verifier.c

@@ -3069,7 +3069,7 @@ static int __check_buffer_access(struct bpf_verifier_env *env,
 {
 	if (off < 0) {
 		verbose(env,
-			"R%d invalid %s buffer access: off=%d, size=%d",
+			"R%d invalid %s buffer access: off=%d, size=%d\n",
 			regno, buf_info, off, size);
 		return -EACCES;
 	}
@@ -3078,7 +3078,7 @@ static int __check_buffer_access(struct bpf_verifier_env *env,
 
 		tnum_strn(tn_buf, sizeof(tn_buf), reg->var_off);
 		verbose(env,
-			"R%d invalid variable buffer offset: off=%d, var_off=%s",
+			"R%d invalid variable buffer offset: off=%d, var_off=%s\n",
 			regno, off, tn_buf);
 		return -EACCES;
 	}