Suppress cppcheck invalidSyntax warninigs

For some reason cppcheck 1.90 is generating an invalidSyntax warning
when the BF64_SET macro is used in the zstream source.  The same
warning is not reported by cppcheck 2.3, nor is their any evident
problem with the expanded macro.  This appears to be an issue with
this version of cppcheck.  This commit annotates the source to suppress
the warning.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #11700

cmd/zstream/zstream_redup.c

@@ -248,6 +248,7 @@ zfs_redup_stream(int infd, int outfd, boolean_t verbose)
 			fflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo);
 			fflags &= ~(DMU_BACKUP_FEATURE_DEDUP |
 			    DMU_BACKUP_FEATURE_DEDUPPROPS);
+			/* cppcheck-suppress syntaxError */
 			DMU_SET_FEATUREFLAGS(drrb->drr_versioninfo, fflags);
 
 			int sz = drr->drr_payloadlen;

include/sys/dmu_redact.h

@@ -39,6 +39,7 @@ redact_block_get_size(redact_block_phys_t *rbp)
 static inline void
 redact_block_set_size(redact_block_phys_t *rbp, uint64_t size)
 {
+	/* cppcheck-suppress syntaxError */
 	BF64_SET_SB((rbp)->rbp_size_count, 48, 16, SPA_MINBLOCKSHIFT, 0, size);
 }
 
@@ -51,6 +52,7 @@ redact_block_get_count(redact_block_phys_t *rbp)
 static inline void
 redact_block_set_count(redact_block_phys_t *rbp, uint64_t count)
 {
+	/* cppcheck-suppress syntaxError */
 	BF64_SET_SB((rbp)->rbp_size_count, 0, 48, 0, 1, count);
 }