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heretic/p_saveg.c: Error out on incomplete read

--- a/src/heretic/p_saveg.c

+++ b/src/heretic/p_saveg.c

@@ -131,7 +131,12 @@

 void SV_Read(void *buffer, int size)

 {

-    fread(buffer, 1, size, SaveGameFP);

+    int retval = fread(buffer, 1, size, SaveGameFP);

+    if (retval != size)

+    {

+        I_Error("Incomplete read in SV_Read: Expected %d, got %d bytes",

+            size, retval);

+    }

 }

 byte SV_ReadByte(void)