fix signature issue from #943 (backport #1018) #1023
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Without this, we get ``` symbol lookup error: /home/ubr/jazzy/install/depth_image_proc/lib/libdepth_image_proc.so: undefined symbol: _ZN16depth_image_proc10convertRgbERKSt10shared_ptrIKN11sensor_msgs3msg6Image_ISaIvEEEES0_INS2_12PointCloud2_IS4_EEEiiii c++filt _ZN16depth_image_proc10convertRgbERKSt10shared_ptrIKN11sensor_msgs3msg6Image_ISaIvEEEES0_INS2_12PointCloud2_IS4_EEEiiii depth_image_proc::convertRgb(std::shared_ptr<sensor_msgs::msg::Image_<std::allocator<void> > const> const&, std::shared_ptr<sensor_msgs::msg::PointCloud2_<std::allocator<void> > >, int, int, int, int) ``` (cherry picked from commit a7c0b09)
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Without this, we get
The issue is the loss of the & in the header, and the addition of the const in the cpp file - fix applied only to the header file.
In the future, we should create a test that catches this sort of runtime error
This is an automatic backport of pull request #1018 done by Mergify.