Remove unneeded calls to pmap_remove_all(). The given page is not mapped.

Reviewed by: tegge

sys/kern/kern_exec.c

@@ -838,7 +838,6 @@ exec_map_first_page(imgp)
 		    (ma[0]->valid == 0)) {
 			if (ma[0]) {
 				vm_page_lock_queues();
-				pmap_remove_all(ma[0]);
 				vm_page_free(ma[0]);
 				vm_page_unlock_queues();
 			}

sys/vm/vm_fault.c

@@ -745,7 +745,6 @@ RetryFault:;
 				/*
 				 * get rid of the unnecessary page
 				 */
-				pmap_remove_all(fs.first_m);
 				vm_page_free(fs.first_m);
 				/*
 				 * grab the page and put it into the