git-gui: Don't bother showing OS error message about hardlinks

If we failed to create our test hardlink for the first object
we need to link/copy then the only recourse we have is to make
a copy of the objects.  Users don't really need to know the OS
details about why the hardlink failed as its usually because
they are crossing filesystem boundaries.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

lib/choose_repository.tcl

@@ -496,10 +496,7 @@ method _do_clone2 {} {
 					[file join .git objects $i] \
 					[file join $objdir $i]
 			} err]} {
-			info_popup [strcat \
-				[mc "Hardlinks are unavailable.  Falling back to copying."] \
-				"\n" \
-				$err]
+			info_popup [mc "Hardlinks are unavailable.  Falling back to copying."]
 			set i [_copy_files $this $objdir $tolink]
 		} else {
 			set i [_link_files $this $objdir [lrange $tolink 1 end]]