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pc, pc64: warn when running out of conf.mem[] entries in meminit()

--- a/sys/src/9/pc/memory.c

+++ b/sys/src/9/pc/memory.c

@@ -568,13 +568,16 @@

 		size = memmapsize(base, BY2PG) & ~(BY2PG-1);

 		if(size == 0)

 			continue;

+		if(cm >= &conf.mem[nelem(conf.mem)]){

+			print("meminit: out of entries, loosing: %#p (%llud)\n", base, (uvlong)size);

+			continue;

+		}

 		cm->base = memmapalloc(base, size, BY2PG, MemRAM);

 		if(cm->base == -1)

 			continue;

 		base = cm->base;

 		cm->npage = size/BY2PG;

-		if(++cm >= &conf.mem[nelem(conf.mem)])

-			break;

+		cm++;

 	}

 	if(0) memmapdump();