MdeModulePkg/Stall: Refine to compare 2 values with the same type
MdeModulePkg/Stall: Refine to compare 2 values with the same type

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hao Wu <f387b71200577e27ccf5abb090fda0ddd187ec6e@intel.com>
Reviewed-by: Feng Tian <e66bb7e9f36c82a029035c5885acf75500d07e68@intel.com>

MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2