prov/lnx: Initialize flags to 0

flags is allocated on the stack which might have some random values.
Ensure it's initialized to 0 because if sent to SHM provider
uninitialized it could cause the provider to misbehave, since it's value
is being checked.

Signed-off-by: Amir Shehata <[email protected]>

prov/lnx/include/lnx.h

@@ -336,7 +336,7 @@ int lnx_create_mr(const struct iovec *iov, fi_addr_t addr,
 	struct fi_mr_attr attr = {};
 	struct fi_mr_attr cur_abi_attr;
 	struct ofi_mr_info info = {};
-	uint64_t flags;
+	uint64_t flags = 0;
 	int rc;
 
 	attr.iov_count = 1;