libxl/disk: avoid aliasing of abs()

Tool chains with -Wshadow enabled by default won't like the function
parameter name "abs", for aliasing stdlib.h's abs(). Rename the
parameter to what other similar functions use.

Fixes: a18b50614d ("libxl: Enable stubdom cdrom changing")
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Reviewed-by: Jason Andryuk <jason.andryuk@amd.com>
Acked-by: Anthony PERARD <anthony.perard@vates.tech>

tools/libs/light/libxl_disk.c

@@ -935,7 +935,7 @@ static void cdrom_insert_stubdom_disk_add_cb(libxl__egc *egc,
                                              libxl__ao_device *aodev);
 static void cdrom_insert_stubdom_query_fdset(libxl__egc *egc,
                                              libxl__ev_time *ev,
-                                             const struct timeval *abs,
+                                             const struct timeval *requested_abs,
                                              int rc);
 static void cdrom_insert_stubdom_parse_fdset(libxl__egc *egc,
                                              libxl__ev_qmp *qmp,
@@ -1259,7 +1259,7 @@ static void cdrom_insert_stubdom_disk_add_cb(libxl__egc *egc,
 
 static void cdrom_insert_stubdom_query_fdset(libxl__egc *egc,
                                              libxl__ev_time *ev,
-                                             const struct timeval *abs,
+                                             const struct timeval *requested_abs,
                                              int rc)
 {
     EGC_GC;