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hexen/sv_save.c: Error out on incomplete read

--- a/src/hexen/sv_save.c

+++ b/src/hexen/sv_save.c

@@ -3372,7 +3372,12 @@

 static void SV_Read(void *buffer, int size)

 {

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

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

+    if (retval != size)

+    {

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

+            size, retval);

+    }

 }

 static byte SV_ReadByte(void)