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Fix 0-byte sections incorrectly printed in map files

Fixes #515

--- a/src/link/output.c

+++ b/src/link/output.c

@@ -312,9 +312,14 @@

 		slack -= sect->size;

-		fprintf(mapFile, "  SECTION: $%04x-$%04x ($%04x byte%s) [\"%s\"]\n",

-			sect->org, sect->org + sect->size - 1, sect->size,

-			sect->size == 1 ? "" : "s", sect->name);

+		if (sect->size != 0)

+			fprintf(mapFile, "  SECTION: $%04x-$%04x ($%04x byte%s) [\"%s\"]\n",

+				sect->org, sect->org + sect->size - 1,

+				sect->size, sect->size == 1 ? "" : "s",

+				sect->name);

+		else

+			fprintf(mapFile, "  SECTION: $%04x (0 bytes) [\"%s\"]\n",

+				sect->org, sect->name);

 		for (size_t i = 0; i < sect->nbSymbols; i++)

 			fprintf(mapFile, "           $%04x = %s\n",