Fix scale-offset filter errors (#5864)

A security fix from 1.14.6 introduced a regression in the scale-offset
filter where normal data values could cause the library to emit an
error (not a crash/segfault).

Fixes GitHub #5861

release_docs/CHANGELOG.md

@@ -495,6 +495,12 @@ Simple example programs showing how to use complex number datatypes have been ad
 
 ## Library
 
+### Fixed a problem with the scale-offset filter
+
+A security fix added to 1.14.6 introduced a regression where certain data values could trigger a library error (not a crash or segfault).
+
+Fixes GitHub issue #5861
+
 ### Fixed security issue CVE-2025-6857
 
    An HDF5 file had a corrupted v1 B-tree that would result in a stack overflow when performing a lookup on it. This has been fixed with additional integrity checks.

src/H5Zscaleoffset.c

@@ -1211,7 +1211,7 @@ H5Z__filter_scaleoffset(unsigned flags, size_t cd_nelmts, const unsigned cd_valu
             minbits_mask <<= i * 8;
             minbits |= minbits_mask;
         }
-        if (minbits >= p.size * 8)
+        if (minbits > p.size * 8)
             HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, 0, "minimum number of bits exceeds size of type");
 
         /* retrieval of minval takes into consideration situation where sizeof