valgrind errors in gis.test and funcs_1.storedproc fixed.

   Field_geom::store() should check if the source is it's value.

sql/field.cc

@@ -7794,7 +7794,8 @@ int Field_geom::store(const char *from, uint length, CHARSET_INFO *cs)
     }
 
     Field_blob::store_length(length);
-    if (table->copy_blobs || length <= MAX_FIELD_WIDTH)
+    if ((table->copy_blobs || length <= MAX_FIELD_WIDTH) &&
+        from != value.ptr())
     {						// Must make a copy
       value.copy(from, length, cs);
       from= value.ptr();