Clean up 'GOMP_MAP_POINTER' handling in 'libgomp/oacc-parallel.c:GOACC_declare'

Given that we 'continue' for 'GOMP_MAP_POINTER', we cannot possibly encounter
it afterwards.

Small fix-up for r230275 (commit 6e232ba4246ca324a663ec5ddf0ba4db5cf3fbad)
"[OpenACC] declare directive".

	libgomp/
	* oacc-parallel.c (GOACC_declare): Clean up 'GOMP_MAP_POINTER'
	handling.

Co-Authored-By: Thomas Schwinge <thomas@codesourcery.com>
diff --git a/libgomp/oacc-parallel.c b/libgomp/oacc-parallel.c
index cf1baf6..d05b3d8 100644
--- a/libgomp/oacc-parallel.c
+++ b/libgomp/oacc-parallel.c
@@ -747,7 +747,6 @@
 	  case GOMP_MAP_FORCE_ALLOC:
 	  case GOMP_MAP_FORCE_FROM:
 	  case GOMP_MAP_FORCE_TO:
-	  case GOMP_MAP_POINTER:
 	  case GOMP_MAP_RELEASE:
 	  case GOMP_MAP_DELETE:
 	    GOACC_enter_exit_data (flags_m, 1, &hostaddrs[i], &sizes[i],