Bug 2095828

=== Steps to reproduce ===

$ touch a b
$ zip x a b
$ file -z x.zip
x.zip: ERROR:[gzip: Stdin has more than one entry--rest ignored] (Zip archive data, at least v1.0 to extract, compression method=store)

$ rm a b x.zip

$ mkdir x
$ touch x/{a,b}
$ zip x x
  adding: x/ (stored 0%)
$ file -z x.zip 
x.zip: ERROR:[gzip: Read failed, No such file or directory] (Zip archive data, at least v1.0 to extract, compression method=store)

===

  The root cause is due to the uncompressbuf method, in rhel7
(https://github.com/file/file/blob/FILE5_11/src/compress.c)

"""
		if ((r = sread(fdout[0], *newch, HOWMANY, 0)) <= 0) {
#ifdef DEBUG
			(void)fprintf(stderr, "Read failed (%s)\n",
			    strerror(errno));
#endif
			free(*newch);
			n = 0;
			newch[0] = '\0';
			goto err;
		} else {
			n = r;
		}
 		/* NUL terminate, as every buffer is handled here. */
"""

and in rhel8 the code is:
(https://github.com/file/file/blob/FILE5_33/src/compress.c)

"""
		if ((r = sread(fdp[STDOUT_FILENO][0], *newch, bytes_max, 0)) > 0)
			break;
		DPRINTF("Read stdout failed %d (%s)\n", fdp[STDOUT_FILENO][0],
		    r != -1 ? strerror(errno) : "no data");

		rv = ERRDATA;
		if (r == 0 &&
		    (r = sread(fdp[STDERR_FILENO][0], *newch, bytes_max, 0)) > 0)
		{
			r = filter_error(*newch, r);
			break;
		}
		free(*newch);
		if  (r == 0)
			rv = makeerror(newch, n, "Read failed, %s",
			    strerror(errno));
"""

  The gzip messages should be printed to stderr, and better if only
when "-d" is passed, to print debug messages.