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test/protocol_control.c: fix build against gcc-14 (-Walloc-size)

gcc-14 added a new -Walloc-size warning that makes sure that size of an individual element matches size of a pointed type:

waypipe triggers it on calloc() calls where member size is used as 1 (instead of member count):

test/protocol_control.c: In function 'make_filled_pattern':
test/protocol_control.c:71:25: error: allocation of insufficient size '1'
 for type 'uint32_t' {aka 'unsigned int'} with size '4' [-Werror=alloc-size]
   71 |         uint32_t *mem = calloc(size, 1);
      |                         ^~~~~~

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