src/test-nextquota: fix build failure with glibc 2.24

glibc 2.24 defines Q_GETNEXTQUOTA but not `struct nextdqblk`. We
need to define it ourselves, but let's give it a hacky name that
won't cause another build error when the definition is added to
glibc.

Signed-off-by: Omar Sandoval <osandov@fb.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>

src/test-nextquota.c

@@ -40,8 +40,10 @@
 
 #ifndef Q_GETNEXTQUOTA
 #define Q_GETNEXTQUOTA 0x800009        /* get disk limits and usage >= ID */
+#endif
 
-struct nextdqblk
+/* glibc 2.24 defines Q_GETNEXTQUOTA but not struct nextdqblk. */
+struct test_nextdqblk
   {
     u_int64_t dqb_bhardlimit;	/* absolute limit on disk quota blocks alloc */
     u_int64_t dqb_bsoftlimit;	/* preferred limit on disk quota blocks */
@@ -54,7 +56,6 @@ struct nextdqblk
     u_int32_t dqb_valid;	/* bitmask of QIF_* constants */
     u_int32_t dqb_id;		/* id for this quota info*/
   };
-#endif
 
 #ifndef Q_XGETNEXTQUOTA
 #define Q_XGETNEXTQUOTA XQM_CMD(9)
@@ -75,7 +76,7 @@ int main(int argc, char *argv[])
 	uint id = 0, idflag = 0;
 	char *device = NULL;
 	char *tmp;
-	struct nextdqblk dqb;
+	struct test_nextdqblk dqb;
 	struct fs_disk_quota xqb;
 
 	while ((c = getopt(argc,argv,"ugpi:d:v")) != EOF) {
@@ -131,7 +132,7 @@ int main(int argc, char *argv[])
 	if (verbose)
 		printf("asking for quota type %d for id %u on %s\n", type, id, device);
 
-	memset(&dqb, 0, sizeof(struct nextdqblk));
+	memset(&dqb, 0, sizeof(struct test_nextdqblk));
 	memset(&xqb, 0, sizeof(struct fs_disk_quota));
 
 	if (verbose)