Does Misc Unit Exist With ID

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#   ROUTINE: DOES MISC UNIT EXIST WITH ID
#       Parameters:
#           r4 = (p_UnitMiscID) Unit misc data ID
#       Returns:
#           r2 =    1, if misc unit data exists for this ID
#                   0, otherwise

8008cbb4: 27bdffe8 addiu r29,r29,-0x0018
8008cbb8: afbf0010 sw r31,0x0010(r29)
8008cbbc: 0c01e9b9 jal 0x8007a6e4                   #   miscUnit = Get Unit Misc Data Pointer (p_UnitMiscID);
8008cbc0: 3084ffff andi r4,r4,0xffff
8008cbc4: 0002102b sltu r2,r0,r2                    #   return (miscUnit >= 0) ? 1 : 0;
8008cbc8: 8fbf0010 lw r31,0x0010(r29)
8008cbcc: 27bd0018 addiu r29,r29,0x0018
8008cbd0: 03e00008 jr r31
8008cbd4: 00000000 nop
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