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Merge pull request #507 from JL2210/null-pointer-fix-1

Fix possible null pointer dereference

--- a/src/asm/lexer.c

+++ b/src/asm/lexer.c

@@ -254,7 +254,7 @@

 	else if (capacity == 0)

 		capacity = 1;

-	while (!feof(f)) {

+	do {

 		if (buf == NULL || size >= capacity) {

 			if (buf)

 				capacity *= 2;

@@ -273,7 +273,7 @@

 			fatalerror("%s: fread error", __func__);

 		size += read_count;

-	}

+	} while (!feof(f));

 	pBuffer->pBufferRealStart = buf;

 	pBuffer->pBufferStart = buf + SAFETYMARGIN;