Fix C4307 warning

[mjcarroll]

@ahcorde I just checked this with compiler explorer, this should be sufficient to clear the warning.

Signed-off-by: Michael Carroll [email protected]

[codecov]

Codecov Report

Merging #198 (1a92f0b) into ahcorde/improve/windows_support (31a1468) will not change coverage.
The diff coverage is n/a.

❗ Current head 1a92f0b differs from pull request most recent head 3194132. Consider uploading reports for the commit 3194132 to get more accurate results

@@                       Coverage Diff                        @@
##           ahcorde/improve/windows_support     #198   +/-   ##
================================================================
  Coverage                            75.07%   75.07%           
================================================================
  Files                                   72       72           
  Lines                                10260    10260           
================================================================
  Hits                                  7703     7703           
  Misses                                2557     2557           

Impacted Files	Coverage Δ
include/ignition/common/Util.hh	100.00% <ø> (ø)

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