i915tex: Relocation fixes:

Increase the number of allowed relocations per batchbuffer.
Fix an assert to avoid an array index overflow.
(Reported by Steve Wilkins)

src/mesa/drivers/dri/i915tex/intel_batchbuffer.c

@@ -311,7 +311,7 @@ intel_batchbuffer_emit_reloc(struct intel_batchbuffer *batch,
                              struct _DriBufferObject *buffer,
                              GLuint flags, GLuint mask, GLuint delta)
 {
-   assert(batch->nr_relocs <= MAX_RELOCS);
+   assert(batch->nr_relocs < MAX_RELOCS);
 
    driBOAddListItem(&batch->list, buffer, flags, mask);